U.S. Foreign Policy 1776–2026 — Institutions, Ruptures, and Continuity

Executive Summary

This is a results-oriented summary examining U.S. foreign policy between 1776 and 2026 through the questions of continuity, rupture, and carrier structure; the justification of its judgments is built in the Fourth Part synthesis and in the relevant chapters.

The study as a whole arrives at a single central thesis: continuity in U.S. foreign policy is carried not in a fixed ideology but in a capacity engine that can be redirected under changing languages of legitimacy. This engine consists of three locked layers — command-decision, military-logistical projection, and budgetary-monetary resource-conversion — and is covered by a separable discourse frame. As the analysis consistently shows, a genuine rupture is the simultaneous reorganization of this engine at the budget, institution, law, and decision levels; a change in the discourse frame alone does not count as a rupture.

Threshold classification gathers into five distinct categories: the 1941–1949 founding cluster is a core rupture; the 1971 Nixon Shock is preservation-through-transformation; 1991 and 2016 are discourse ruptures; 2001 is split on the foreign axis and core on the domestic axis; and 2022–2026 appears two-faced (maturation + new threshold), a period that cannot yet be adjudicated and could not be verified.

The study’s most firmly grounded finding is this: on the foreign-policy axis the single core rupture is the 1941–1949 founding cluster; beyond it there is no core rupture. The core effect of 2001, as the analysis shows, appears not in the foreign-policy apparatus but in a separate object — the security state; for this reason the two objects are recorded separately.

The method rests on three instruments: an object-specified core criterion tied to the foreign-policy apparatus, a three-layer falsification standard (reversal/attenuation/splitting), and the marking of evidence level embedded in language. The study claims no methodological invention; it applies and integrates the tools of established historical institutionalism (Mahoney-Thelen, Capoccia-Kelemen) and Zakaria’s capacity mechanism to this case.

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General Framework and Methodology

This study is a comparative historical analysis examining U.S. foreign policy across the 250-year span from 1776 to 2026 through the questions of continuity, rupture, and carrier channel. The aim is not to write a complete history; it is to construct a criterion that distinguishes a genuine rupture from a discourse rupture, and continuity from superficial resemblance, and to apply that criterion to concrete historical material. The central question is: in U.S. foreign policy, what has genuinely changed, and what has merely been reproduced under changing threat-objects and languages of legitimacy? The study consists of four parts: the first (1776–1945) establishes the framework and tests the basic continuity and rupture candidates for the first time; the second (1945–1991) applies the framework to the Cold War order; the third (1991–2026) tests whether the change of threat-object transformed institutional capacity; the fourth synthesizes the three periods comparatively.

1. The Object of Analysis

The study’s primary object of analysis is the U.S. foreign-policy apparatus: external doctrine, the external security architecture, the alliance structure, military deployment, and the outward-facing executive war authority. A threshold’s “rupture” class is determined by measuring its effect on this object. If a threshold produces a major transformation at the level of domestic law, domestic security, or the citizen-state relation but not in the foreign-policy apparatus, it is recorded — clearly distinguished — not as a foreign-policy core rupture but as a core rupture in a separate object, the security state. A classification made without fixing the object of analysis is treated as invalid, because the same criterion would then lead to opposite results.

2. The Primary Unit of Analysis and the Evidence Hierarchy

The primary unit of analysis is the doctrine text and the statutory regime; the objects of testing are military deployment, trade regulations, war-authority practices, and changes in institutional function. Presidential messages, constitutional and statutory texts, budget and appropriation records, official strategy documents, and judicial rulings are taken as primary evidence; institutional reports, committee documents, and personnel-donation permeability data are used as secondary evidence. In analyzing the capital-state relation, the “beneficiary / coordination / command” distinction is defined as an analytical instrument: an actor’s benefiting from a decision, coordinating it, and issuing it each require different evidentiary burdens. But this distinction is not systematically tested in this study; capital-state permeability is deliberately left an open field, no claim is constructed on it in the body, and the subject is placed on the subsequent research agenda. The instrument is only defined, kept in reserve for use when this field is tested in the future.

3. Epistemic Discipline

Throughout the study, every factual claim is presented in a language that openly shows the evidentiary burden it carries. In this public version the evidence level is carried not by separate marks but by being embedded directly in the modality of the sentence: document-based findings in a flat, modeless form; strong inferences arising from the study’s joint reading of multiple periods and bodies of evidence with citation-markers such as “as the analysis shows” or “by the study’s finding”; propositions with weaker support in cautious modalities such as “very likely” or “it may be argued”; and points that cannot be confirmed by a source with the phrase “could not be verified.” Thus no sentence produces a certainty exceeding its evidence level. This marking applies only to factual claims: definitional sentences, framework and method explanations, chapter transitions, and statements about the text’s own structure carry no modality, because they make no verifiable claim about the world; their flat form is not an exception but the scope-limit of this regime. The discipline that signals evidence level is lost in no version of the study; only its form changes — in the detailed version with explicit marks, in this version embedded in the modality of language.

4. The Core Rupture Criterion

A threshold counts as a core rupture if it produces, in the foreign-policy apparatus, a simultaneous and permanent reorganization at the budget, institution, legal-authority, and decision-center levels. The criterion is applied through a three-layer falsification standard: reversal — if a later period was able to reverse the change, the change is not core; attenuation — is the effect as deep and simultaneous as claimed; splitting — is the effect a rupture on some planes and continuity on others. If an institutional or budgetary transformation occurs in the domestic-security or citizen-state object but not in the foreign-policy apparatus, the threshold is not entered on the foreign-policy core list; it is recorded separately as internal-vertical expansion.

5. The Taxonomy of Expansion

Not every “expansion” carries the same weight; three types are distinguished, each by its observable criterion and falsification condition. External-horizontal expansion is the carrying of the foreign-policy logic to a new geographic or overseas plane: a new base or operational area emerges, but the foreign-policy core (decision architecture, alliance structure) is not rebuilt; if the event rebuilds that architecture, it is not this type, its class is split/partial rupture. Internal-vertical expansion is the carrying of the external-security order’s logic to the plane of domestic law, domestic security, and surveillance: open-ended executive authority, domestic surveillance capacity, the removal of the wall between foreign intelligence and domestic investigation, permanent exception law; if the transformation remains confined to external operations and the domestic architecture does not change, it is not this type, its class is a core rupture in the security-state object and a split rupture in the foreign-policy object (the two objects are recorded separately). Building of a new order is not the carrying of the existing order but the establishment of a new external institutional-strategic architecture: a new alliance system, new external institutions, a permanent strategic decision architecture; if the event does not build a new external architecture but carries the existing one to another plane, it is not this type, its class is a foreign-policy core rupture.

6. The Carrier Structure: The Capacity Engine and the Discourse Frame

Continuity is not carried by separate channels that can change independently of one another. Executive-centered decision capacity does not function without a budget; a budget produces no external power without flowing into the military-logistical core; the financial-monetary architecture forms no leverage without budget and executive decision. By the study’s basic construction, these are not separate engines but the mutually locked working layers of a single capacity engine. This engine consists of three locked layers — command/decision (executive-centered decision capacity), projection (the military-logistical core), and resource-conversion (budgetary-monetary continuity, including the financial architecture) — and no carrier role is attributed to these layers separately. The engine is covered by a separable discourse frame (the language of legitimacy) that changes from period to period.

As the analysis shows, the thesis’s load-bearing contrast is not among the layers but between the capacity engine and the language of legitimacy. The separability of the discourse frame from the engine becomes visible in a series of natural experiments: in 2016 executive rhetoric broke off, capacity (NATO membership, the defense budget, deployment) persisted; in 1991 anti-communist legitimacy collapsed, capacity persisted; in 1917–1919 Wilsonian universalist discourse rose, but capacity did not consolidate because of the Senate’s rejection. By the assessment that follows, what is separated is not legitimacy itself but a particular discourse frame; the engine requires some quantity of legitimation fuel, but the particular blend — anti-communism, war on terror, great-power competition — is interchangeable. The financial-monetary architecture is not a separate carrier channel but part of the resource-conversion layer; nonetheless the network-chokepoint coercion mode (collecting information over the network and cutting off access) carries a qualitatively different function from military-logistical coercion, and this function is recorded separately.

7. The Classification Categories

Thresholds are divided into five categories: core rupture (building of a new order) — simultaneous, permanent re-founding across four planes in the external apparatus; split/partial rupture — expansion to a new plane while the existing core is preserved; discourse/legitimacy rupture — the discourse frame changes, the capacity engine persists; preservation-through-transformation — the founding rule is deliberately abandoned in a moment of crisis, capacity is preserved; and confirmation point / continuity core / negative control — threshold types that produce no rupture. The fourth category — preservation-through-transformation — rests on the conversion mechanism in historical institutionalism (Mahoney & Thelen, 2010); the difference is this: conversion operates at one level (the rule is preserved, its function changes), while preservation-through-transformation operates at two levels (the founding rule is abandoned, capacity is preserved under another form). This category cannot be assigned to a threshold from the outset (prospectively); it is assigned only when it is later (retrospectively) shown that capacity was in fact preserved. The falsification condition is clear: if, after the founding rule is abandoned, central decision and external economic-leverage capacity are permanently preserved, the category is preservation-through-transformation; if that capacity comes under external discipline or the center is lost, it is a core decline. Without this negative condition the category becomes unfalsifiable.

8. The Falsification Condition of the Whole Thesis

The thesis is cleanly falsifiable: if a period can be shown in which the capacity engine collapsed but continuity was carried by the discourse frame, or in which capacity collapsed while the discourse frame stayed fixed, the thesis “continuity is carried in capacity” would be falsified. Across 1776–2026 no collapse of the capacity engine was observed, while the discourse frame changed repeatedly. By the study’s finding, this observation supports the thesis but does not turn it into a tautology: the falsifying configuration is defined and its occurrence is possible — it simply did not occur in this period.

9. The Distinctions of Discourse, Institution, and Authority

Throughout the study, two intersecting distinctions are maintained. The first is the discourse / institution / material-infrastructure distinction: change in the official language, change in the institutional structure, and change in material capacity (budget, base network, deployment) are not counted as the same thing; a rupture on one plane may coexist with continuity on another. The second is the legal-authority / actual-effect distinction: the binding legal ground of a doctrine or law and its actual implementing force may not coincide; the production of legitimacy and the capacity to implement are measured separately. These two distinctions are the diagnostic tools used in operating the core-rupture criterion and the taxonomy of expansion.

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Part One: 1776–1945 — Survival, Continental Expansion, and the Construction of the Structural Rupture

I. Periodic Skeleton

1776–1815: Survival and Structural Uncertainty. To understand this period’s foreign policy one must see the early Republic’s real constraint: the new state lacks the capacity to risk direct military conflict with the major European powers; this constraint lies, as a structural necessity, at the base of the distanced posture that later periods would read as “principle” or “ideology.” By the study’s finding, the founding period’s foreign policy is the product not of a purely ideological preference for neutrality but of a military, fiscal, and commercial capacity limit; nonetheless the capacity constraint and the assessment of strategic opportunity operated at the same time, and the two did not exclude one another. Washington’s Farewell Address advice to avoid permanent alliances deserves, in this framework, to be read in the category of external systemic constraint. The institutional structure has not yet settled: the State Department was founded in 1789 but remained small, and the reach of congressional committees is equal to or broader than the secretary’s. The Jay Treaty (1794) documents this tension — the executive negotiates, meets the Senate’s sharp opposition; this is the first documentable example of the executive-legislative contention that runs continuously through the study. The War of 1812 is both a period-closing and an instructive test: the declaration of war comes from Congress, and the influence of the commercial circles pressuring the Madison administration and of the “War Hawks” congressional bloc can be traced in primary sources; the Treaty of Ghent (1814) produced no clear territorial change but in fact fixed U.S. independence and borders in North America. By the study’s classification, 1812/1815 is not the period’s genuine rupture but a structural confirmation point — a test of whether the Western Hemisphere could in fact be protected against the British threat; the genuine rupture comes at the start of the next period with the Monroe Doctrine.

1815–1865: The Monroe Doctrine, Continental Expansion, and the Dual Structure. This period’s logic rests on two mutually reinforcing axes — the Monroe Doctrine (1823) and continental expansion — and, as the analysis shows, although both are presented in different ideological languages, they reflect the same geographic priority (North America and the Western Hemisphere). The Monroe Doctrine is not a law but an executive doctrine document in the format of a Presidential Message: taking effect without need of congressional approval but resting on no binding legal ground, this form is a concrete example of the distinction between the production of legitimacy and legal authority. By the study’s finding, although the doctrine’s binding implementation capacity was limited at first, its power to produce legitimacy retrospectively was high, and from 1823 onward it was reproduced with different instruments in every major Presidential period; this repetition is one of the first strong candidates of the continuity pattern. Continental expansion in this period proceeds through law, budget, and decision mechanisms: the annexation of Texas (1845), the Oregon Treaty (1846), the Mexican War (1846–1848), and the subsequent territorial gains. Manifest Destiny in this process functions as a legitimacy language that both mobilizes the masses and produces votes in Congress; but the actual mechanism of expansion operated through law, budget, and military deployment — an early example of the distinction between discourse frame and capacity (§6): language mobilizes, the material channels carry the actual expansion. The Civil War period (1861–1865) produces an instructive anomaly: the Lincoln administration sought to ensure that Europe did not recognize the Confederacy, and Secretary of State Seward took on a critical diplomatic role. In the study’s assessment, this is the period in which foreign policy was in fact steered by a domestic crisis and foreign-policy agency was lowest, and it is recorded as the negative-control example of the domestic-foreign interaction test.

1865–1917: Between Expansion and Withdrawal. This period, because of its internal heterogeneity — especially the differing course before and after the 1890 Mahan turn — requires further testing later in two sub-phases, 1865–1890 and 1890–1917. It is also the period in which the concept of “isolationism” is applied in the most misleading way: as the study shows, the United States’ keeping clear of European alliances does not mean keeping clear of global interventionism; expansion in the Western Hemisphere and the Pacific and naval-power investments intensify precisely in this period. The institutional effect of Mahan’s sea-power theory (1890) can be traced from primary and secondary evidence: the Navy budget experienced periodic jumps from the 1880s onward, and naval-base policy and fleet architecture were transformed. As the analysis shows, the Mahan effect operated through the institutional rather than the discursive channel — the primary evidence is not a doctrine text but the change in budget and deployment. 1898 is this period’s load-bearing threshold: the Spanish-American War and the subsequent annexation of the Philippines are the first time the U.S. acquired permanent overseas territory geographically detached from the mainland. When the three-layer falsification standard is applied, reversal cannot be established (the U.S. maintained its presence in the Pacific and did not relinquish the Philippines until 1946); attenuation partly holds (the rupture is genuine in terms of external expansion, not in terms of moving closer to Europe); and splitting is decisive — 1898 transformed not the hemisphere policy but the Pacific policy, and the Monroe-based hemisphere logic did not change. By the result of this test, 1898 is an external-horizontal expansion (§5-A) and is classified as a split/partial rupture: by dividing in two a pattern presumed to be a single continuity, it shows hemisphere protection and Pacific expansion as two separate axes operating through different mechanisms. The 1904 Roosevelt Corollary, by declaring that the President has authority to intervene in the Western Hemisphere without congressional approval, in fact extends the Monroe Doctrine by executive hand; this is a concrete case of the legal-authority / actual-effect distinction (§9), showing how executive interpretation can produce a functional rupture without the statutory text changing.

1917: A Genuine Rupture or a Temporary Deviation? Evidence for a genuine rupture: the U.S. for the first time actively joined a European war, Wilson’s “make the world safe for democracy” discourse offered a new universalist legitimacy language, and an actual expansion in the war bureaucracy occurred. Evidence for a temporary deviation: after the war the Senate rejected the Treaty of Versailles and League of Nations membership (1919). As the analysis shows, 1917–1919 began as a rupture attempt at the institutional and legitimacy levels but remained partial when the legislative brake engaged — a case (§6) in which the discourse frame moved on its own but could not consolidate capacity: the universalist language rose, institutional capacity did not settle because of the Senate’s rejection. The cross-period negative control reinforces this: when 1919–1939 is traced, the posture of keeping clear of European alliance politics again becomes dominant; the 1935–1937 Neutrality Acts are among the clearest examples of Congress directly determining the direction of foreign policy, restricting the President’s sale of arms/credit to belligerent states and prohibiting the presence of U.S. citizens on ships bound for war.

1941–1945: Structural Rupture and Intra-War Transformation. At the legal level the 1941 Lend-Lease Act, by opening a legal basis for Roosevelt’s transfer of arms to Britain and the Soviets before Pearl Harbor, in fact ended the neutrality regime. At the institutional level the federal bureaucracy expanded dramatically, the OSS (the precursor of the later CIA) became operational, and the foundations of the military-industrial relationship were laid. At the budgetary level defense spending rose above thirty percent of GDP; this ratio declined after the war but, unlike after 1919, never returned to its prewar level — the extent to which mobilization turned into a permanent national-security state requires a separate institutional-permanence test, conducted in the Second Part. At the decision-center level Roosevelt conducted de facto war preparation before Congress’s formal declaration of war (the Atlantic Charter, August 1941; shoot-on-sight orders against submarines, September 1941); as the analysis shows, this is one of the most documented examples of the executive pulling the actual decision center ahead of the legal framework. When the three-layer test is applied, reversal cannot be established (NATO, the Marshall Plan, and the Cold War configuration produced continuity), attenuation is limited by the postwar permanence of the institutional reorganization, and splitting holds (the rupture operated fast at the military and institutional levels, more slowly at the ideological level). The study’s most strongly grounded rupture judgment is here: 1941 is the strongest genuine rupture of this 169-year period — it produced a cluster of change operating simultaneously and permanently at the budget, institution, decision-center, and strategy-document levels. Again as the analysis shows, 1941 should be read not as a core on its own but as the first leg (military-war mobilization) of the 1941–1949 founding cluster; the cluster’s economic (1944/45), security (1947), and alliance (1949) legs are treated in the Second Part.

II. Answers to Sub-Questions

The presidential–congressional balance. The moments in which Congress was decisive — the 1812 declaration of war, the 1819–1820 trade laws, the 1919 Versailles rejection, the 1935–1937 Neutrality Acts — can be set beside the moments in which the executive came to the fore — the proclamation of the Monroe Doctrine (1823), Tyler-Polk’s limited notification of Congress over the Texas annexation, the 1904 Roosevelt Corollary, Wilson’s 1917 message, Roosevelt’s 1939–1941 executive practices. As the analysis shows, the executive comes to the fore in crisis and the congressional brake engages after the crisis; but this oscillation is not symmetric — each executive expansion could not be fully reversed, and in areas such as diplomatic practice and budget flexibility institutional accumulation worked, as a periodic tendency, in the executive’s favor. In the weak-link test the moment the congressional brake was bypassed fastest is Roosevelt’s pre-1941 practices: the legal weak link, ship transfers by executive order on grounds of “national-security urgency”; the institutional weak link, bilateral negotiations conducted without notifying the Foreign Affairs Committee; the operational weak link, the start of de facto war practice in the Atlantic before public support had formed.

Foreign affairs, the war bureaucracy, commerce/capital, and public opinion. The State Department remained small throughout this period, and the diplomatic service completed professionalization only at the start of the 20th century; the bureaucracy’s institutional weight is relatively limited, and the secretary’s influence is mostly tied to a personal relationship with the Presidency. It may be argued that commercial and capital circles, especially in the 1815–1898 period, formed pressure fields shaping the foreign-policy agenda; there are only secondary-level traces in this direction. A primary-level evidence set that would determine the concrete contribution of capital-state permeability to foreign policy in 1865–1917 could not be constructed in this study; this field requires deepened research with proxy-indicator and budget-personnel permeability data. Public-opinion and media influence is observed most clearly in the 1898 and 1917 ruptures; mobilization, legislative pressure, and legitimacy wrapping are three distinct mechanisms through which public opinion can enter the decision channel, but which of them served the primary function in which rupture could not be disaggregated in this study. The war bureaucracy in this period appears not as a permanent power center but as a structure that expands in crisis and contracts afterward — this picture changes fundamentally after 1941.

Recurring ideological narratives. The language of commerce and prosperity shows almost uninterrupted continuity and is the most strongly supported candidate of the continuity pattern. The language of republican liberty and anti-monarchism is determinative especially in the early period, but the same vocabulary was used for both interventionist and withdrawalist policies; this elasticity weakens the legitimacy language’s link to the decision channel. The language of civilization and Anglo-Saxon supremacy intensifies in 1865–1917 in the Philippine debates and South America policy, appearing simultaneously in congressional debates, executive texts, and the period’s press. The Wilsonian universalism and democracy-spreading language emerged sharply in 1917, found no institutional ground after the 1919 Senate rejection, but was brought back onto the stage with different instruments in the 1940s; it may be argued that this language operated between 1917 and 1945 as an “intermittent pattern” — a legitimacy source reactivated under certain conditions — but raising this to the level of a structural feature requires cross-period verification.

Genuine ruptures. By the study’s classification: 1812/1815 is not a genuine rupture but a structural confirmation point; the Civil War (1861–1865) is, in foreign-policy terms, not a genuine rupture but a negative control in which the domestic crisis temporarily suspended foreign policy; 1898 is a split/partial rupture (external-horizontal), transforming the Pacific axis without changing the hemisphere pattern; 1917 is a discourse rupture with institutional continuity, left half-finished by the 1919 Senate rejection; 1941 is the period’s genuine and most comprehensive rupture, the military leg of the founding cluster.

The carrier channel of continuity. Three competing explanations were tested: continuity through institutions (the channel is not strong enough, since the State Department remained weak), continuity through legislation (some frames are permanent, but the legislative brake sometimes cut continuity), and continuity through strategic culture (Western Hemisphere priority, sea-power investment, and trade-route protection recurred with similar instruments under different administrations and discourses). By the study’s finding, 1776–1945 foreign-policy continuity is predominantly a pattern carried jointly by strategic culture and material-institutional capacity: the reproduction of certain geographic priorities and instrument logics despite institutional and ideological change. The observable indicators of this finding — recurring geographic-allocation densities in successive periods (the Western Hemisphere and the Pacific), periodic jumps in naval and budget allocations, the geographic continuity of deployment and base choices, the similar recurrence of trade-route protection decisions under different administrations — are of an arguable character; the judgment will be strengthened by a systematic comparison of whether the same geographic priorities were supported by similar budget decisions. The carrier structure observed in this period is the early and not-yet-institutionalized form of the capacity engine (§6) that will mature in later chapters: decision capacity expands in crisis but is not fully reversed, material infrastructure (navy, bases) accumulates, the discourse frame changes; the full institutionalization of the engine comes with the 1941–1949 cluster.

III. Open Research Areas

Capital-state permeability is insufficiently tested in this study; a primary-level evidence set that would determine the channel effect of commercial and capital circles on foreign-policy decisions could not be constructed. The splitting finding of 1898 awaits confirmation; carrying the distinction to the level of a structural feature requires a periodic comparison of doctrine texts, military deployment, and budget allocation. The public-opinion-decision chain could not be clarified; which of mobilization, legislative pressure, and legitimacy wrapping served the primary function in which rupture could not be separated. The parallel material periodization remains incomplete; the relation between the 1880s naval investments and 1898 at the material level is a separate deepening heading. The 1919–1929 field-shift test was not addressed; whether intervention continued through financial mechanisms in this period of apparent military withdrawal should be tested at a subsequent stage.

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Part Two: 1945–1991 — The Architecture of Global Hegemony, the National-Security State, and the Institutionalization of Continuity

I. Periodic Skeleton

The primary task of this part is to answer the question flagged in the First Part: through which institutions, laws, budget structures, and ideological languages did the rupture opened in 1941 become a permanent order after 1945? The methodological framework and epistemic discipline are the same as in the First Part.

1945–1949: The Transition from War to the Cold War Order and the Completion of the Founding Cluster. The period’s basic question: did the executive-centered war order opened in 1941 attain a permanent institutional form between 1945 and 1949? When the war ended, the temporary mobilization structures were quickly liquidated, troop numbers fell, and the production apparatus largely withdrew. As the analysis shows, this is a negative control that concretizes the warning that “mobilization is not identical with permanence”: while part of the capacity dispersed, the decision architecture became permanent. The economic leg of the founding cluster is established at the start of the period: in July 1944 the Bretton Woods Conference designed the IMF and IBRD, and the Bretton Woods Agreements Act took effect in 1945, placing the dollar-centered fixed-exchange-rate regime on a legal footing. By the study’s finding, Bretton Woods meets the object-specified core criterion — at the institution (IMF/IBRD), law (Articles of Agreement + Agreements Act), and decision-center (the Treasury’s turning into the founding center of the external-economic order) levels; but meeting the criterion does not make it a separate core rupture, because a cluster leg can also meet the criterion. Bretton Woods is the economic-monetary leg of the 1941–1949 founding cluster — part of the sequential but single founding logic of 1941 military mobilization, 1944/45 economic order, 1947 security architecture, and 1949 alliance. Again within the study’s framework, Bretton Woods also establishes the monetary operating form of the capacity engine’s resource-conversion layer: the dollar’s reserve status and the payment infrastructure are part of budgetary-monetary continuity, not a separate carrier channel. That this layer is locked to the engine is visible in the dollar’s status depending on the security umbrella — a large share of safe U.S. assets is held by countries with a military tie to the U.S. (Weiss, 2022). The infrastructure of the financial architecture’s network-chokepoint coercion mode was established in this cluster, its weaponization maturing in later periods. The National Security Act (July 1947) institutionalized the CIA and the National Security Council and organized the national military structure under one roof; the Department of Defense took its official name with the completion of this framework in 1949. This is one of the study’s most firmly grounded founding judgments: the 1947 act produced an asymmetric transition that liquidated war mobilization while making the security decision infrastructure permanent — the military crowd dispersed, the decision architecture was preserved. The Truman Doctrine (March 1947) foregrounds the language of security, the Marshall Plan (June 1947) the language of economic reconstruction; as the study shows, although the two documents use different legitimacy vocabularies, they share the same geopolitical priority — the protection of Western Europe against Soviet influence; it is an early example (§6) of the orientation of capacity staying fixed while the discourse frame can change. The founding of NATO (April 1949) is the first permanent military alliance established in peacetime in U.S. history; as the analysis shows, the “keep clear of European alliances” pattern running since 1783 passes the reversal threshold in 1949 — NATO splits this pattern in the genuine sense. But the splitting is not one-directional: in Asia and the Middle East the avoidance of permanent multilateral alliance continued.

1950–1968: Containment, Hot Wars, and the Intervention Regime. The basic question: was the containment doctrine, established in the language of defense, transformed into an intervention regime? NSC-68 (April 1950) is an executive document that dramatically expanded the scope of the Soviet threat and proposed quadrupling the share of defense spending; the Korean War began before the document took effect, and the war functionally accelerated NSC-68’s budget demands. In the study’s assessment, NSC-68 is a pre-decision threat frame; Korea produced the political ground necessary for that frame to be put into practice. From this it may be argued that Korea can be read as the threshold event triggering the implementation of a ready-standing transformation agenda; but disaggregating this reading from an external-shock interpretation requires further testing, and since it rests on a single case in this study it is kept at the level of a proposition. (The mechanism’s second case — September 11 → the 2001 AUMF — is linked in the Third Part; the claim is strengthened once the double-case is established.) The Korean War (1950–1953) is the first major military engagement conducted without a declaration of war; Truman used a “police action” frame and did not directly invoke Congress’s war-declaration authority. As the analysis shows, the weak link identified in the First Part for the pre-1941 era — de facto war preparation outside Congress — goes a step further here: de facto war was conducted without congressional approval being sought. The Eisenhower period (1953–1961) is marked by the “New Look” doctrine, which preferred nuclear deterrence and covert-operation capacity over large ground forces; by the study’s finding, this preference reflects the postwar systematization of the shift toward indirect instruments in place of direct intervention. The covert operations in Iran (1953), Guatemala (1954), and Cuba (1961) are the period’s primary test cases; but since the primary evidence on the full decision chain is partly classified, it could not be fully constructed in the study and was left to open research. The Gulf of Tonkin Resolution (August 1964) is not a declaration of war but a delegation of authority to the executive; rather than closing the gap between legal form and actual function, it widens it. As the analysis shows, Tonkin is the threshold at which Congress authorized rather than oversaw the executive, and the oversight brake became symbolic.

1968–1979: Erosion, Recalibration, and Preservation-through-Transformation. The basic question: a genuine braking, or a change of form in executive capacity? The War Powers Resolution (1973) provides that the executive cannot use military force without congressional approval within 60 days; Nixon vetoed the law and Congress overrode the veto. In the study’s assessment the three-layer test operates thus: reversal cannot be established (in the later period no president fully complied with the law), attenuation holds (in some engagements it produces a de facto notification basis), splitting holds (it partly works in small operations while being systematically overstepped in large engagements). The judgment that follows: the 1973 law is not a genuine braking but a limited-scope, selectively applied notification regime. The Nixon Doctrine (1969) declares that the security burden will be transferred to regional allies; as the analysis shows, this is the doctrinalization of the shift from direct military projection to a proxy and burden-sharing model. Détente (1969–1979) did not formally abandon the containment doctrine, and SALT I (1972) did not stop the capacity competition — détente is more a diversification of instruments than a change of direction.

1971 — The Nixon Shock: preservation-through-transformation. On 15 August 1971 the U.S. unilaterally suspended the dollar’s convertibility to gold, beginning the end of the 1944 Bretton Woods fixed-exchange-rate regime. In the study’s assessment the four-plane test yields this: no new external institution was established, no new external authority regime was produced (a crisis interpretation of the existing executive-economic authority), the decision was taken within a narrow executive-Treasury-Fed circle; therefore 1971 is neither a building of a new order nor an internal-vertical expansion. As the analysis shows, 1971 is the core example of the preservation-through-transformation class — with its difference from the conversion mechanism (Mahoney & Thelen, 2010; see §7), that is, by operating at two levels: the founding rule (the gold link) was deliberately abandoned, but the dollar-centered capacity was preserved (Vernengo, 2021). By the study’s finding, this capacity was reproduced in the 1970s through petrodollar arrangements; the claim that this consolidation rests on a single secret 1974 agreement, however, could not be verified by a source — the study takes a multiple-arrangement reading rather than a single-agreement one (Spiro, 1999) and builds no judgment on the myth. This classification is retrospective, not prospective: as the analysis emphasizes, 1971 is not a guaranteed maneuver designed from the start but the unraveling of a fragile Cold War bargain, and one of the options was the U.S. failing to win preservation (Gavin, 2004); preservation is not a guaranteed design but a realized outcome, and the class is assigned only when it is later shown that capacity was in fact preserved. It may be argued that 1971 is the purest case of the thesis’s “abandon the rule in crisis, preserve the capacity” mechanism and at the same time its falsifiability test. The class’s falsification condition is written explicitly: if, after the founding rule is abandoned, central decision capacity and dollar-based external economic leverage are permanently preserved, it is preservation-through-transformation; if that capacity comes under external discipline or the center is lost, it is a core decline. In short: if abandoning gold did not preserve the dollar, the thesis collapses. Without this negative condition the class slides into “continuity whether the rule is kept or broken” and becomes unfalsifiable.

1979–1991: Re-hardening and Late-Cold-War Hegemony. The basic question: was the structure, partly constrained in the 1970s, re-fortified in the 1980s? The Carter Doctrine (January 1980) declares the Gulf region to be a vital U.S. interest; as the study shows, this carries a functional resemblance to the Monroe Doctrine’s Western-Hemisphere logic — the geographic priority expands but the basic logic (a military response to a threat against a region deemed vital) stays the same; it is an example of the geographic-axis expansion of the continuity pattern (full classification in Sub-Question 2.7). In the Reagan period the defense budget rose by roughly fifty percent in real terms; as the analysis shows, this revives the militarily-budgetarily relatively constrained momentum of the 1970s and supports the finding that the 1970s “braking” was not a genuine rupture but a periodic adjustment. The Iran-Contra scandal (1986–1987) documents the executive conducting covert-operation financing in fact overstepping Congress’s explicit prohibition; in the study’s assessment this is one of the rare examples in which the operational weak link is supported by primary evidence. In the dissolution of the USSR (1989–1991) the three-layer test operates, in the study’s assessment, thus: reversal is partly passed (the disappearance of the threat leaves the containment doctrine objectless), attenuation is strong (the base network, intelligence capacity, and intervention practices did not shrink), splitting holds (the ideological frame collapsed, the institutional structure persisted). As the analysis shows, 1989–1991 produces a genuine rupture in the language of legitimacy and partial continuity in the institutional structure — the anti-communist frame collapsed, the capacity engine persisted; this is one of the most documented natural experiments of the discourse frame’s separability from capacity (§6) and is the same structural type as 2016 (the frame changed, the engine persisted; only the trigger differs).

II. Answers to Sub-Questions

The presidential–congressional balance. As the analysis shows, the asymmetric oscillation identified in the First Part operates in this period too, but the accumulation in the executive’s favor is more pronounced. The moments in which Congress was decisive (the 1947 NSA negotiations, the Church Committee investigations of 1975–1976, the 1973 War Powers Resolution) can be set beside the moments in which the executive came to the fore (Korea, Tonkin, the CIA covert operations, the Reagan-era covert financing). By the study’s finding, executive capacity left a broader permanent ground in each crisis than in the one before; the 1947 institutional framework was not in fact reversed by any congressional intervention, including the 1973 brake. Weak-link test: legal — the bypassing of war-declaration authority through delegation/executive interpretation (Korea, Tonkin, Grenada, Panama); institutional — the structural limitation of committees’ access to covert-operation information; operational — the disabling of budget and oversight procedures through covert financing channels in Iran-Contra.

Institutions and decision centers. One of the study’s well-documented findings: the NSC is a decision-preparation mechanism directly tied to the President, outside the official bureaucracy; the channel that filters which information reaches the President and in what form is not the State Department but the NSC — one of the institutional examples of the information-monopoly mechanism. The GDP share of defense spending never returned between 1950 and 1990 to its prewar (1940) level; war mobilization became permanent at the budget level. The CIA’s covert-operation capacity was institutionalized in this period; primary evidence is partly accessible (the Church reports, lifted classifications), the full picture is of limited visibility — this field is left to open research as a not-yet-constructed evidence set, not an unverifiable fact.

Legislative and legal authority regimes. The 1947 NSA is the framing law of this period; Tonkin and the subsequent authority texts are periodic expansions of this framework. As the analysis shows, in this period military engagement used not a declaration of war but a delegation of authority and a language of urgency that widened executive discretion; the distance between legal form and actual function increased relative to the First Part. The existence of the War Powers Resolution did not eliminate the executive’s search for a legal framework; the executive turned the law’s notification requirements into a legitimation instrument — the brake law became the executive’s legitimacy wrapper.

Budget, deployment, material infrastructure, and the financial axis. The number of U.S. military bases abroad turned from practically zero in 1945 into a permanent global network in the 1960s; the navy, air power, and nuclear capacity produced a permanent budget requirement within the “triad deterrence” frame. By the study’s finding, the period’s distinctive observation is that the base network, the budget flow, and the executive-decision capacity move together: the three moved as one, none produced external power on its own — this confirms the capacity-engine framework (§6) and shows that the layers cannot be disaggregated as separate carriers; which layer is “strongest” cannot be established with primary evidence and is therefore not claimed. The period’s new element is the maturation of the monetary operating form of the resource-conversion layer: the dollar’s reserve status and the global payment infrastructure acquire a form of financial leverage. This leverage is not a separate channel — it is locked to the engine — but it carries a mode different from military-logistical coercion: cutting off network access (chokepoint) is an instrument of pressure separate from ground force (Farrell & Newman, 2019); the mode’s dependence on the engine is visible in the dollar’s status resting on the security umbrella (Weiss, 2022). It may be argued that the full weaponization of this mode matured not in this period but in the post-Cold-War sanctions regimes; its trace is followed in the Third Part.

Languages of ideological legitimacy. As the analysis shows, anti-communism is this period’s dominant legitimacy language — the Cold War version of the First Part’s “republican liberty” language — and because it could be used for both interventionist and withdrawalist policies, this elasticity weakens the discourse’s link to the decision channel. The defense of the free world and democracy runs from Truman to Reagan; it is the institutionally-grounded version of Wilsonian universalism, and after 1947 the fit between the ideological frame and the institutional structure is higher than in the previous period. Whether the language of development, aid, and modernization served to cloak geopolitical containment aims or a genuine development agenda cannot be adjudicated without being tested with decision output and budget flow. The human-rights discourse becomes pronounced under Carter and is used selectively under Reagan; the systematic exemption of the language from certain allies turns it from a consistent principle into a selective legitimacy instrument.

Capital, commerce, and state permeability. The “military-industrial complex” warning in Eisenhower’s 1961 farewell address is one of the period’s most documented intra-elite signaling texts. This study has not constructed the primary-level evidence set on whether defense procurements and weapon-system decisions were shaped by industrial and employment priorities apart from the strategic-capacity calculation; capital-state permeability was deliberately left an open field, and no claim was constructed in the body. The “beneficiary / coordination / command” instrument of §2 is defined precisely for use in this field; since an actor’s benefiting from a decision and an actor’s issuing it require different evidentiary burdens, no strong judgment on “capital influence” is constructed without testing the distinction. The limited level that can be observed is that the financial architecture and military deployment supported the same geopolitical priorities through different instruments — mutually reinforcing but separate mechanisms, at the level of interest alignment, not a command relationship.

Genuine and false ruptures. By the study’s classification: the 1947 NSA is a genuine core rupture — the security leg of the founding cluster, a permanent change remaining in force for over 75 years. Korea (1950–1953) is not an exception but a model — by patterning military engagement without a declaration of war, it fortified the 1947 rupture at the operational level. The 1971 Nixon Shock is preservation-through-transformation. The 1973 War Powers is not a genuine rupture but a limited notification regime. The 1979 Carter Doctrine is tied to the criterion below. 1989–1991 is the period’s strongest rupture candidate, but it produces a genuine rupture in the discourse frame and continuity in the capacity engine — 1941 built the structure, 1991 changed the structure’s legitimacy frame but did not dismantle the engine. As for the Carter Doctrine, under the object-specified criterion it is not a core rupture: in the four-plane test it establishes no new external institution, produces no new permanent authority regime, builds no new decision architecture; it extends the existing executive intervention authority to a new geography (the Gulf) — the doctrinal form of external-horizontal expansion, in the same taxonomic neighborhood as 1898, not a core. The “functional resemblance” to Monroe may be argued as an analogy at the mechanism level rather than the structural level: both carry the logic of a military response to a threat against a region deemed vital, but the threat-object, geography, and period differ; the resemblance points to the geographic expansion of the continuity pattern, and the evidence does not carry it to the level of structural identity.

III. Open Research Areas

The evidentiary limit of CIA and covert-operation data is this part’s most critical methodological constraint; the Church reports offer partial primary evidence, while the full decision chain of the 1950s and 1960s is still inaccessible. The measurable bounds of the military-industrial complex are insufficiently tested; the hypothesis explaining the permanence of the defense budget by political-economy dynamics should be tested at a separate stage with budget-contract-decision chain data. The link between public opinion and the decision chain could not be disaggregated in this period either. The relation between dollar hegemony and military expansion was treated in the body within the capacity-engine framework but left to systematic testing at the quantitative-series level.

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Part Three: 1991–2026 — The Unipolar Moment, Threat Redefinition, and the Adaptation of the Security Architecture

The primary question of this part: once the Soviet threat disappeared, did the security state genuinely contract, or did the institutional capacity built since 1947 continue — generating new languages of legitimacy and new modes of operation — while the threat-object changed? The primary units of analysis: presidential doctrines, authorization statutes and AUMF regimes, intervention decisions, base-network and deployment data, intelligence and homeland-security architecture, sanctions and financial instruments, technology and cyber capacity. This part partly covers the current period; for 2016–2026 the completeness of primary evidence is more limited than for earlier periods, and that limit is noted where relevant.

I. Periodic Skeleton

1991–2001: The Unipolar Moment and the Search for a New Legitimacy. The Gulf War (1991) is the first major intervention coinciding with the end of the Cold War; UN Security Council legitimacy was sought and a broad coalition was assembled. As the study shows, this reflects the temporary rise of the language of “international law and collective security” as the anti-communism frame became dysfunctional; but whether this language determined the actual decision chain could not be disaggregated. Throughout the 1990s intervention practices continued — no-fly zones in Iraq, Somalia (1993), Haiti (1994), Bosnia (1995), Kosovo (1999) — and the Kosovo intervention was carried out without a UN Security Council resolution; as the analysis shows, this shows that the language of “international legitimacy” was used as a selective instrument rather than a consistent principle. In 1999 Poland, the Czech Republic, and Hungary became NATO members, and the Kosovo operation tested the alliance’s out-of-Article-5 operational capacity; by the study’s finding, NATO’s expansion of function and geography instead of being liquidated after the Cold War is the most documented example of the capacity engine (§6) persisting while the discourse frame collapsed. Between 1991 and 2001 the GDP share of defense spending declined — a limited negative control showing partial retrenchment was possible; but the persistence of the base network, intelligence capacity, and intervention practices during this decline makes visible the budget/capacity distinction the analysis emphasizes: the budget can shrink, the engine can persist.

2001–2008: 9/11, the Global War on Terror, and a Rupture Splitting Across Two Objects. The 2001 AUMF, enacted three days after September 11, granted the executive the authority to use force against states, organizations, and persons that planned, authorized, or harbored the attacks, and the text contained no geographic or temporal limit. As the analysis shows, the 2001 AUMF is one of the broadest legislative instruments delegating advance, open-ended authority to the executive — while Tonkin was confined to a single geography, the 2001 AUMF recognizes no boundary. But the object of this breadth must be disaggregated: the AUMF’s open-ended authority feeds a core transformation in the security-state object (domestic surveillance, exception law, institutional authority); on the foreign-policy axis it builds no new architecture, being an extension of the open-ended executive war authority established in 1947. Thus the qualifier “broad” does not move 2001 into the foreign-axis core — the core effect of the breadth lies in a separate object. The Afghanistan intervention (2001) has a relatively strong legitimacy basis; the Iraq War (2003) was conducted with the “preemptive strike” doctrine and the claim of weapons of mass destruction; in the study’s assessment the Bush Doctrine’s preemptive-strike frame legitimizes the use of military force before a threat materializes.

The “crisis triggers what is ready” mechanism — second case and upgrade. Because this mechanism rested on a single case (NSC-68/Korea) in the Second Part, it was kept at the level of a proposition; here, with the addition of a second independent case, it rises to a finding the analysis now supports more strongly. Case 1: NSC-68 (a budget agenda ready in April 1950) + Korea (the June shock) → the implementation of the budget transformation. Case 2: the open-ended executive war authority accumulated since 1947 (ready institutional capacity) + September 11 (shock) → the 2001 AUMF, the broadest extension of that capacity. The observation of the same mechanism structure in two different periods — crisis does not create ready-standing capacity/agenda from nothing, it activates it — lifts the finding above the single-case level. Still, one nuance is cautiously flagged: the “ready” element is a policy agenda (budget) in the first case and an institutional capacity (the authority architecture) in the second; the shared structure holds only at the abstract level — “crisis activates, does not create.” The double-case strengthens the mechanism; no more concrete identity is argued.

2001 — a split rupture on the foreign-policy axis; a core rupture on the security-state axis. At this point the study’s most original analytical distinction comes into play and is presented as a study-judgment — not as a world-fact. When the three-layer test is applied to the foreign-policy apparatus, as the analysis shows, the 2001 AUMF is an unrevoked extension of the undeclared-war / open-ended executive authority architecture established in 1947 (the chain Korea 1950 → Tonkin 1964 → AUMF 2001); no new external institutional-strategic architecture was built, so 2001 is a split/expansionary rupture on the foreign axis, not in the “building of a new order” class of 1941/1947. By contrast, the Patriot Act (October 2001), DHS (November 2002; 22 federal agencies under one roof), and the domestic surveillance regime — by removing the legal wall between foreign intelligence and criminal investigation — produced a permanent and simultaneous transformation in the security-state object at the budget, institution, law, and decision levels. As the analysis shows, this is the core example of internal-vertical expansion (§5-B): a core rupture in the security-state object. But since this rupture emerged outside the study’s primary object of analysis (the foreign-policy apparatus), it is not entered on the foreign-policy core list and is recorded as a separate object. The qualitative difference the study observes is this: 1947 built the outward-facing security state, 2001 turned it inward — and this inward turn is the core transformation of the security state, not of the foreign-policy apparatus. In the areas of targeted killing, Guantanamo, and “enhanced interrogation,” the Justice Department memos that constructed legality through executive legal interpretation are primary evidence; as the analysis shows, the exception regime in this period is produced through legal ambiguity — the executive can both claim compliance with the law and conduct operations beyond oversight.

2008–2016: Erosion, Smart Power, and the Light Footprint. The Obama period foregrounded the language of withdrawal and multilateral order in official discourse; drone strikes in the same period reached a far higher frequency than under Bush. As the study shows, the discourse reflects the language of withdrawal, the practice a low-visibility high-frequency engagement — as visible military instruments decrease, covert and remote instruments increase; capacity changes form, it does not shrink. In the Libya intervention (2011) a UN Security Council resolution was obtained, and the “civilian protection” authority evolved into a regime-change output; as the analysis shows, the distance between the authorization text and the actual operational target shows that the legitimacy wrapper can operate independently of the decision output (§9). The Snowden documents (2013) documented bulk data-collection operations — under PRISM and similar programs — covering U.S. citizens and foreign leaders; in the study’s assessment these documents point to the expansion of the technical capacity of post-2001 domestic-foreign security integration. It may be argued that the Pivot to Asia discourse became pronounced in this period, but the shift in budget and deployment data remained delayed and limited relative to the discourse — the distance between doctrine and implementation is reproduced.

2016–2020: Nationalist Rhetoric, Continuity Infrastructure. During the Trump period U.S. NATO membership persisted, the military presence in Syria continued, sanctions regimes against Iran were expanded, and the defense budget grew. As the study shows, this period is the one in which the gap between discourse and institutional practice opened widest: while the executive produced discursive rupture, the function of the security bureaucracy largely persisted. Structurally this is the same type as 1991 — the discourse frame changed, the capacity engine persisted (§6); the two periods are differently triggered examples of the same class (discourse rupture): in 1991 an external condition (the USSR) collapsed the frame, in 2016 executive rhetoric changed it, and the engine persisted in both. It may be argued that the security bureaucracy maintained certain operational priorities despite the directives of the elected executive; but reading this as “conscious resistance” rather than “institutional inertia” requires a higher evidentiary burden. In China policy the convergence of the technology, trade, and security axes becomes pronounced in this period; as the analysis shows, this is among the first systematic examples of the language of security expanding to encompass economic instruments.

2021–2026: Great-Power Competition, Geoeconomic Power, and the Two Faces of the Financial Axis. This period is still ongoing; the bulk of the judgments are kept at the inference and hypothesis level. The U.S. provided comprehensive arms, intelligence, and financial support to Ukraine without direct military intervention; it may be argued that this carries a functional resemblance to the Nixon Doctrine’s burden-sharing logic, but the direct threat to European security concretizes the NATO commitments — the resemblance is at the mechanism level, structural identity is not proven. The 2022 CHIPS Act aimed to onshore semiconductor production and restrict advanced-chip exports to China; the October 2022 Export Control rule prohibited the transfer of the most advanced chip technology to China. It may be argued that the conversion of economic instruments into a security instrument gained institutional and legal ground in this period; but this is a single-anchored trend reading about the current period, and a structural judgment requires the period to close and a second anchor.

The 2022 sanctions — a two-faced threshold. The 2022 Russia sanctions (SWIFT cutoff, freezing of central-bank reserves, export restrictions) cannot be flattened to a single reading. One face is maturation: as the analysis shows, it is the endpoint of the 78-year accumulation of the dollar-centered architecture built in 1944 and its chokepoint coercion mode (§6; Farrell & Newman, 2019) (Zarate, 2013; Farrell & Newman, 2023). The other face is a new threshold: in scope, speed, and coordination, CRS and Treasury assessments consider these sanctions unprecedented; the scale of the reserve freeze and the SWIFT cutoff are a new geoeconomic threshold (CRS IF12062). It is moreover argued that overuse produces counter-dollarization/backlash (McDowell, 2023). Whether 2022 produced a permanent institutional rupture on the 1947 scale, however, could not be adjudicated in this study and could not be verified; the period is open and must be re-tested once it closes. It may be argued that AUKUS (2021) and the strengthening of the QUAD carry a functional resemblance to the founding of NATO; but these structures have not yet reached an equivalent level of legal and political bindingness — structural equality cannot be established. The tension between the Pivot to Asia discourse and the actual allocation of resources/attention persists in this period too.

II. Answers to Sub-Questions

The presidential–congressional balance. The 2001 AUMF is still in force today and has been expanded through executive interpretation against organizations that did not exist in 2001; as the analysis shows, the authorization text’s lack of a temporal and geographic limit makes permanent the executive’s capacity to read every new threat within this frame — the 1947 NSA had not been revoked, and the 2001 AUMF is not being revoked either. Weak-link test: legal — the interpretive application of the AUMF expanding beyond the original threat; institutional — the limitation of intelligence committees’ oversight of covert operations by information asymmetry; operational — the management of the drone and cyber-operation decision chain within a narrow circle inside the executive.

Institutions and decision centers. As the analysis shows, the creation of DHS is the merging of the domestic and foreign security architecture under a single institutional roof — the institutional expression of the inward turn, between 2001 and 2003, of the security state built outward-facing in 1947 (its classification in Period 3.2). It may be argued that cloud infrastructure, AI capacity, and data processing deepen the technology-security permeability through defense procurements; but where this relation falls between “market contract” and “strategic coordination” could not be established with a primary-evidence set, and the field is left open.

Legislative and legal authority regimes. As the analysis shows, the AUMF regime is the pattern of the executive resolving its concern for legal legitimacy by maximally limiting congressional oversight. The sanctions regimes against Iran, Russia, North Korea, and China rest on the weight of the dollar in the international financial system; sanctions are not legally counted as war, but in strategic effect they are an instrument of pressure — resting on the chokepoint mode of the resource-conversion layer (§6) — that produces results comparable to military pressure.

Budget, deployment, and material infrastructure. After 1991 the defense budget relatively declined, after 2001 it expanded dramatically again, and the base network changed geography in this period. By the study’s finding, physical deployment is more variable, institutional capacity and budget more permanent — this makes visible a form-function distinction among the layers of the capacity engine (§6): even if the physical form of the projection layer (which base, which geography) changes, its function (permanent budget demand and operational-capacity generation) persists. The addition of remote-engagement capacity to the traditional base-ground force-navy triad transforms the content of the projection layer but does not change its place in the engine; this is not a claim about weight-ordering among layers, but a single layer changing form.

Languages of ideological legitimacy. The language of liberal-order protection (1991–2001), as seen in Kosovo, could be set aside when the UN veto mechanism did not work — a selective instrument used when the operational-legitimacy requirement is met. The war-on-terror language (2001–2008) is the functional continuation of anti-communism; its elasticity is even greater, because defining the threat as an organization/ideology rather than a state effectively removes the geographic and temporal limit. The non-application of the democracy and human-rights discourse to allies such as Saudi Arabia, Egypt, or Pakistan is a documentable pattern showing that the language derives from instrumental calculation, not principle. It may be argued that the language of great-power competition and technology security (post-2016) does not replace the war-on-terror language but is added to it, trying to reproduce the unifying role anti-communism had in the Cold War; but whether it has gained institutional ground could not be fully tested.

Capital, technology, and state permeability. Defense procurements have concentrated in this period in an ever smaller number of large firms, and personnel permeability is documentable. It may be argued that the defense/intelligence contracts of AWS, Microsoft, and Google deepen the technology-security permeability; but whether this relation enters the “strategic coordination” frame — interest alignment or command (§2 instrument) — could not be settled with primary evidence. By contrast, as the analysis shows, within the post-2022 Russia sanctions the joint application of SWIFT disconnection, the freezing of central-bank reserves, and export restrictions is the most comprehensively documented example in this project of the chokepoint coercion mode of the financial architecture (§6) — the concrete core of the two-faced threshold in Period 3.5: the maturation of the monetary layer built in 1944 as a weapon, and at the same time a new threshold.

Genuine and false ruptures. By the study’s classification, 1991 is a legitimacy rupture, not a system rupture — the base network did not shrink, NATO expanded its function, intervention practice persisted. 2001 is a split rupture on the foreign axis (AUMF = a 1947 extension, no new external architecture) and a core rupture on the security-state axis (Patriot Act/DHS) — the two objects are recorded separately, it does not enter the foreign-policy core list. 2016 is the project’s clearest discourse rupture, an example of institutional continuity, the same structural type as 1991. As for 2022–2026, a definitive answer to this question is epistemically impossible; the period is ongoing — it could not be verified in this study.

III. Open Research Areas

Whether the post-1991 “contraction” thesis fully collapses against the data has not been clarified in this study; systematically measuring the distance between budget and capacity requires a separate research stage. Whether the war on terror is temporary or permanent could not be fully tested; although the 2001 AUMF’s remaining in force points to institutional permanence, the shift of the legitimacy language toward great-power competition leaves open whether the architecture is changing form or declining. The real mechanism between technology firms and the security state is this study’s most pronounced evidentiary gap. Whether sanctions, finance, and technology restrictions are “war by other means” remains conceptually open; whether the China rivalry is a new threat or a new object of old containment has not been clarified in this period.

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Part Four: Comparative Synthesis — Continuity, Rupture, and the Carrier Structure (1776–2026)

I. Introduction

This part adds no new events; it compares the findings of the first three parts on the same scale and separates what is continuity, what is rupture, and what is only a change of discourse frame. The distinctions used do not change: fact/inference/hypothesis; discourse/institution/material infrastructure; legal authority/actual effect; capacity engine/discourse frame.

II. A Comparative Map of the Ruptures

Classification is done according to the object-specified core criterion (§4): a threshold is a core rupture if it produces simultaneous and permanent reorganization in the foreign-policy apparatus at the budget, institution, law, and decision levels; thresholds that do not meet this criterion are classified as split rupture, discourse rupture, preservation-through-transformation, confirmation point, or negative control.

The study’s most firmly grounded classification is the following. Core rupture — a single cluster, 1941–1949: the four legs are sequential but parts of a single founding logic — 1941 military-war mobilization (Lend-Lease, OSS), 1944/45 international economic order (Bretton Woods, IMF/IBRD), 1947 national security architecture (NSC/CIA/DoD), 1949 alliance (NATO); as the analysis shows, this cluster is the only foreign-policy threshold producing simultaneous permanent reorganization across four planes. Preservation-through-transformation — 1971: gold convertibility was deliberately abandoned, the dollar-centered capacity preserved; the class is assigned retrospectively and its falsification condition is open (if abandoning gold did not preserve the dollar, the thesis collapses). Split ruptures: 1898 opened the Pacific axis without changing the hemisphere pattern (external-horizontal); 2001 (foreign axis) is an extension of the 1947 executive-war authority through the AUMF, building no new external architecture; the 1979 Carter Doctrine is the expansion of executive intervention authority to a new geography, not a core. Discourse ruptures: in 1917 universalist discourse rose, institutional capacity did not settle with the 1919 Senate brake; 1991 and 2016 are the same structural type, the discourse frame changed and the engine persisted, only the trigger differs. Confirmation/negative control: 1812/1815 fixed North American independence and did not transform the pattern; the 1861–65 Civil War is a negative control pacifying foreign policy by a domestic crisis; the 1973 War Powers is not a real brake but a selective notification regime. Separate object — the security state: 2001 (domestic axis) Patriot Act, DHS, and domestic surveillance produced a core rupture (internal-vertical) in the security-state object, but this is outside the study’s primary object (foreign policy) and does not enter the foreign-policy core list.

Threshold Table

Threshold / Period	Class	Category	Brief rationale
1812/1815	Confirmation point	5	Fixes independence, does not transform the pattern
1815–1865 (Monroe)	Continuity core	5	A geographic-priority formulation; repeated reproduction
1861–1865 (Civil War)	Negative control	5	Foreign policy pacified by a domestic crisis
1898	Split rupture (external-horizontal)	2	Preserves the hemisphere, opens the Pacific
1917	Discourse rupture (half, with the 1919 brake)	3	Discourse rises, the institution does not settle
1941–1949	Core rupture (founding cluster, four legs)	1	Simultaneous permanent re-founding across four planes
1971	Preservation-through-transformation	4	Rule abandoned, capacity preserved; retrospective/falsification-conditional
1991	Discourse rupture (same type as 2016)	3	The frame collapsed, the engine persisted
2001	Foreign: split · Domestic: core (separate object)	2 + separate	AUMF = a 1947 extension; DHS/Patriot = security-state core
2016	Discourse rupture (same type as 1991)	3	Rhetoric broke off, the institution persisted
2022–2026	Open/cautious, two-faced (could not be verified)	open	Maturation + new threshold; the period has not closed

III. The Carrier Structure of Continuity

As the analysis shows, continuity is carried not by separate channels that can be ranked by weight, but by a single capacity engine. The engine consists of three locked layers — command-decision, projection, resource-conversion — and these layers are causally inseparable: the executive without a budget, the budget without flowing into logistics, the financial leverage without budget-decision, produces no external power. Therefore the question “which layer is the strongest carrier” cannot be answered with primary evidence and is not asked in the study; continuity is carried in the engine as a whole. The load-bearing contrast is not within-channel but between the engine and the discourse frame; by the study’s finding, the discourse frame’s separability from the engine is visible in natural experiments: in 1991 the anti-communist frame collapsed and the engine persisted, in 2016 executive rhetoric broke off and the engine persisted, in 1917 universalist discourse rose but the engine did not consolidate with the Senate’s rejection. What is separated is not legitimacy itself but a particular discourse frame; the engine requires some quantity of legitimation fuel, but the particular blend (anti-communism ↔ war on terror ↔ great-power competition) is interchangeable. The thesis’s falsification condition is clear: a period in which the engine collapsed and continuity was carried by the discourse frame, or in which the discourse was fixed while the engine collapsed, would falsify the thesis; across 1776–2026 no engine collapse was observed and the discourse changed repeatedly — by the study’s finding the thesis is supported but is not a tautology, because the falsifying configuration is defined and possible. As a limited observation on the decision-preparation channel, it may also be argued that since 1947 the center where decisions are prepared has concentrated on the NSC/CIA/Pentagon line rather than the State Department, with State remaining a more variable actor operating with periodic weight. Here the distinction is clear — this is not a weight-ranking among the engine’s layers; the question of which layer is the “stronger carrier,” as noted above, is not asked in this study and cannot be answered with primary evidence. What is stated is only an observation about the institutional locus where decisions are prepared, and this observation has not been firmly established with primary evidence.

IV. The Presidential–Congressional Balance: The Long-Term Model

The periods in which Congress produced a real brake (the 1919 Versailles rejection, the 1935–37 Neutrality Acts) are not periods in which executive capacity shrank but in which a single policy channel was closed; the periods in which it functioned as a legitimating/symbolic brake are more widespread (the Tonkin delegation of authority, the War Powers notification regime, the 2001 AUMF open-ended authority). By the inference the study repeats most consistently across the three parts, the long-term model is not a one-directional shift but an asymmetric oscillation: the capacity the executive gains in a crisis is larger than what Congress takes back after the crisis; the mechanism of accumulation differs in each crisis, its direction is constant.

V. Institutions Changed; Did the Decision Logic Change?

As the analysis shows, institution names have changed (a weak State Department → the rise of the Pentagon/NSC/CIA → the addition of DHS/NSA/private contractors), but the basic pattern of the decision logic — geographic priority, threat definition, and the shaping of budget orientation in executive-centered decision-preparation channels rather than congressional pre-direction — has not changed. As the study emphasizes, official institutional change and decision-center change do not always coincide; the picture becomes misleading when read from institution names rather than the decision-preparation channel.

VI. The Change of the Threat-Object and the Reuse of the Same Capacity

Across the three parts the threat-objects succeeded one another: the British threat (1776–1815), continental rivalry/the hemisphere (1815–1898), imperial rivalry/the Pacific (1898–1941), the Axis threat and World War II mobilization (1941–1945), Soviet containment (1945–1991), terror/domestic-foreign fusion (2001–2016), great-power competition/China (2016–2026); each transition carries its own conditions, and the quality, geography, and instrument requirements differ seriously from period to period. By contrast, as the analysis shows, at each threat change the capacity engine was repositioned rather than liquidated: executive-centered decision capacity expanded rather than dissolving, the military-logistical infrastructure changed geography but did not shrink in volume, the intelligence apparatus was directed first outward then inward then outward again, the budgetary core was never permanently liquidated in any transition after 1945. Whether this pattern is a conscious strategic choice or institutional inertia cannot be closed with the current evidence set. As the study also records, continuity has a limit: Soviet containment (state-centered, geographic), the war on terror (non-state, geography-less), and the China rivalry (technology/supply/finance-weighted) cannot be reduced to a single pattern.

VII. A Comparison of the Languages of Ideological Legitimacy

Seven legitimacy vocabularies were traced: republican liberty/anti-monarchism, Manifest Destiny, civilization/Anglo-Saxon supremacy, Wilsonian universalism, the free world/anti-communism, the war on terror, great-power competition/economic national security. As the analysis shows, these languages operate on four planes (public mobilization, legislative legitimacy, international alliance, moral framing) and their defining feature is their high elasticity — the same vocabulary could legitimize both intervention and abstention from intervention. But elasticity does not render the discourse functionless: the 1935–37 Neutrality Acts effectively narrowed the executive’s space of options, and the open-ended threat definition of the war-on-terror language made possible the boundlessness of the 2001 AUMF. As the study emphasizes, the discourse that narrows the space of options and the discourse that legitimizes a decision after the fact are two different mechanisms; which dominated in which period is a continuing question of legitimacy-language analysis.

VIII. Capital, Technology, and State Permeability

The methodological difficulty of this field is accepted from the outset: interest alignment, personnel permeability, and direct decision-steering are different mechanisms; movement in the same direction is not evidence of coordination (§2 instrument). What this project actually shows is the following: the concentration of defense procurements in a small number of large firms, Eisenhower’s 1961 warning, and the use of the financial architecture as a weapon in chokepoint mode in the 2022 Russia sanctions — this last being the project’s most comprehensively documented example. What remains at the hypothesis level is the following: explaining the permanence of the defense budget by political-economy dynamics, the conversion of the technology-security relation into strategic coordination, the direct steering of the decision channel by capital interests — these cannot be closed without being tested with primary evidence and are the priority addresses of the subsequent research agenda.

IX. Final Judgment

The conclusion the study as a whole reaches is this: in U.S. foreign policy the threat-objects have changed, the languages of legitimacy have transformed, the institution names have been renewed; but by the analysis’s most firmly grounded finding, the capacity engine — executive-centered decision capacity, military-logistical infrastructure, the budgetary-monetary core — has come out longer-lived than every major rupture. The study’s most firmly grounded judgment is that on the foreign-policy axis the single core rupture is the 1941–1949 founding cluster, while 2001 descends to a split rupture on the foreign axis with its core effect lying in a separate object (the security state). Within this framework the genuine ruptures did not dismantle continuity; they restructured it and generally continued it by adding capacity. By contrast, three fields could not be closed as definitively proven — capital-state permeability, the public-opinion-decision chain, and the technology-security relation; in these fields the bulk of the findings are at the hypothesis and proxy-indicator level, and the “coordination” versus “command” distinction must be preserved with the same rigor in the subsequent stage.

X. Originality and Positioning

The core intuitions of this study are not original: the theses that continuity operates beneath ideology (Williams, The Tragedy of American Diplomacy, 1959), that executive authority accumulates in crisis (Schlesinger, The Imperial Presidency, 1973), that the military-industrial core is permanent (Mills/Eisenhower), and that power arises from state capacity (Zakaria, From Wealth to Power, 1998) are established. The methodological framework too rests on established historical institutionalism: the typology of gradual change (Mahoney & Thelen, 2010), the critical juncture and counterfactual test (Capoccia & Kelemen, 2007), path dependence (Pierson; Collier & Collier). The application of these tools to U.S. foreign policy and security institutions is also not new; historical institutionalism has, for example, already been applied to the origin and continuity of the NSC (Mabee, 2011). The study’s contribution is not to establish this theory or method; it is to apply and integrate them to the 1776–2026 case of U.S. foreign policy with an object-specified four-plane rupture threshold, the capacity/discourse distinction, and the marking of evidence level embedded in language. The study openly acknowledges that the bulk of its results and tools overlap with the established literature; its claim is not a new method but a disciplined application and synthesis.

XI. The Subsequent Research Agenda

First priority: a systematic proxy-indicator analysis to test the decision-channel effect of capital-state permeability (the budget-contract-personnel triad). Second: a periodic comparison of the public-opinion-decision-chain link with a three-channel distinction (mobilization, legislative pressure, legitimacy wrapping). Third: cross-tabulating the parallel material-technological periodization with the geopolitical periodization (especially 1880–1900 and 2001–2026). Fourth: the re-testing, once the period closes, of whether the 2022–2026 period’s great-power-competition frame produces institutional permanence on the 1947 scale.

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Bibliography

Citations are carried register-neutral (identical to the forensic master). Two layers: (a) primary documents, (b) secondary/theoretical. The study’s originality positioning (Part 4 §X) rests openly, as content antecedents, on Williams, Schlesinger, Mills/Eisenhower, and Zakaria; and, as method foundation and closest antecedents, on Mahoney-Thelen, Capoccia-Kelemen, Pierson, and Collier & Collier. The full citations are held in the forensic master.