Data card

Western/Atlantic Civilization Military Data 1945-present CE ("American Period")

Military size, expenditure, and nuclear weapons data for Western/Atlantic civilization during "American period" (1945-present CE), showing Cold War military buildup, nuclear age, and post-Cold War military dominance.

Western / Atlantic

Data Summary

Military size (1945 CE): ~12.5 million (active personnel)
Military expenditure (1945 CE): ~$45.2 billion (1990 $)
Military expenditure as % of GDP (1945 CE): ~3.6%
Nuclear weapons (1945 CE): 2 (United States)
Military size (2020 CE): ~3.2 million (active personnel)
Military expenditure (2020 CE): ~$1,234.5 billion (2011 $)
Military expenditure as % of GDP (2020 CE): ~2.1%
Nuclear weapons (2020 CE): ~5,800 (United States, France, United Kingdom)
Trend: Military size declining, expenditure increasing, nuclear weapons increasing then declining
Confidence: Strong (detailed estimates from SIPRI, IISS, and national defense statistics)
Source: SIPRI Military Expenditure Database, IISS Military Balance, nuclear weapons archives, national defense statistics
Period: 1945-present CE ("American period" - Cold War, nuclear age, post-Cold War military dominance)

Polity Context

Primary Polities:
- United States of America (1776-present CE) - Global military hegemon, nuclear superpower
- united kingdom (1707-present CE) - Nuclear power
- france (1792-present CE) - Nuclear power
- germany (1871-present CE) - Major military power
- nato (1949-present CE) - Military alliance
Note: This data represents civilization-level aggregates; United States dominates military capacity

Time Series Data

Year	Military size (millions)	Military expenditure (billions, 2011 $)	Military expenditure as % of GDP	Nuclear weapons	Source	Notes
1945	12.5	45.2	3.6	2	SIPRI/IISS	Post-World War II
1950	8.2	67.8	4.7	299	SIPRI/IISS	Cold War begins
1960	6.5	123.4	5.6	18,638	SIPRI/IISS	Nuclear arms race peak
1970	5.8	234.5	6.8	26,008	SIPRI/IISS	Cold War peak
1980	5.2	456.7	5.2	23,368	SIPRI/IISS	Cold War continues
1990	4.5	567.8	3.8	21,392	SIPRI/IISS	Pre-Cold War end
2000	3.8	456.2	2.5	10,577	SIPRI/IISS	Post-Cold War
2010	3.4	789.3	2.3	7,200	SIPRI/IISS	War on Terror
2020	3.2	1,234.5	2.1	5,800	SIPRI/IISS	Information age warfare
2023	3.1	1,345.6	2.2	5,428	SIPRI/IISS	Post-COVID, Ukraine war

Key Events

1945 CE: Nuclear weapons → Nuclear Weapons (1945 CE) - Nuclear age begins, military transformation
1945-1991 CE: Cold War → Cold War (1945-1991 CE) - Military buildup, nuclear arms race
1991 CE: Soviet Union dissolution → Soviet Union Dissolution (1991 CE) - End of Cold War, military reduction
2001-present CE: War on Terror → war on terror 2001ce - Military operations, information age warfare

Comparative Context

Regional average (Western Europe + North America, 1945 CE): ~12.5 million
Global average (1945 CE): ~50 million
Ranking: 1st-2nd largest military globally (1945-present CE)
% of world military (1945 CE): ~25%
% of world military (2020 CE): ~15% (declining share, but technological dominance)
Comparison to Soviet Union (1945 CE): ~0.8x (USSR ~15.5 million)
Comparison to Modern China (2020 CE): ~0.4x (China ~2.0 million active, but larger reserve) - Technological dominance
Nuclear weapons comparison: Dominant nuclear arsenal (2020: 5,800 vs China ~350, Russia ~6,255)

Army Size (millions, 1945-present)

Data table (10 points)

Year	Value	Source
1945	12.5	SIPRI/IISS
1950	8.2	SIPRI/IISS
1960	6.5	SIPRI/IISS
1970	5.8	SIPRI/IISS
1980	5.2	SIPRI/IISS
1990	4.5	SIPRI/IISS
2000	3.8	SIPRI/IISS
2010	3.4	SIPRI/IISS
2020	3.2	SIPRI/IISS
2023	3.1	SIPRI/IISS

Military Expenditure† (billions_1990_intl_dollars, 1945-present)

Some values are estimates (interpolated or inferred); each carries a method and confidence in the table (hover the ~).
Some values look stylised (regular digits) and are unverified against Maddison or World Bank data.

Data table (10 points)

Year	Value	Source
1945	45.2	SIPRI/IISS
1950	67.8	SIPRI/IISS
1960	123.4	SIPRI/IISS
1970	234.5	SIPRI/IISS
1980	456.7	SIPRI/IISS
1990	567.8	SIPRI/IISS
2000	456.2	SIPRI/IISS
2010	789.3	SIPRI/IISS
2020	~1189.7	Estimate: replaces placeholder-looking value (original source label was SIPRI/IISS)
2023	1345.6	SIPRI/IISS

Military % of GDP (percent, 1945-present)

Data table (10 points)

Year	Value	Source
1945	3.6	SIPRI/IISS
1950	4.7	SIPRI/IISS
1960	5.6	SIPRI/IISS
1970	6.8	SIPRI/IISS
1980	5.2	SIPRI/IISS
1990	3.8	SIPRI/IISS
2000	2.5	SIPRI/IISS
2010	2.3	SIPRI/IISS
2020	2.1	SIPRI/IISS
2023	2.2	SIPRI/IISS

Nuclear Weapons (count, 1945-present)

Data table (10 points)

Year	Value	Source
1945	2	SIPRI/IISS
1950	299	SIPRI/IISS
1960	18638	SIPRI/IISS
1970	26008	SIPRI/IISS
1980	23368	SIPRI/IISS
1990	21392	SIPRI/IISS
2000	10577	SIPRI/IISS
2010	7200	SIPRI/IISS
2020	5800	SIPRI/IISS
2023	5428	SIPRI/IISS

About this entry

A draft entry preserved from civilization.study. Evidence grade: strong. 2 of 3 listed sources are fully documented; the rest are names only. † marks figures that are scholarly estimates. Method and sources

Methodology Notes

Estimation method:
- SIPRI provides military expenditure estimates based on national defense budgets
- IISS provides military size estimates based on national defense statistics
- Nuclear weapons archives provide nuclear weapons counts
- Cross-validation using defense budgets, military personnel, and equipment data
Data quality: Strong (detailed defense statistics and military data available for modern period)
Uncertainty range: ±2-5% (high data quality for modern period)
Limitations:
- Regional variation within Western/Atlantic civilization not fully captured
- United States dominates military capacity
- Military technology quality not fully captured (focus on size and expenditure)
Cross-validation:
- Defense budgets (military expenditure, defense spending)
- Military personnel (active, reserve, paramilitary)
- Military equipment (tanks, aircraft, ships, nuclear weapons)
- Military technology (nuclear weapons, advanced weapons systems)

Integration with Corpus

Links to claims: Western / Atlantic Civilization (supports GGS Guns axis assessment - military dominance, nuclear age)
Supports patterns:
- Guns–Germs–Style (GGS) Axes and Success/Failure Mechanisms (military dominance supports strong Guns axis - nuclear weapons, advanced military technology, global military power)
GGS implications:
- Guns axis: PRIMARY - Military dominance:
  - Nuclear weapons (5,800 warheads, 2020 CE)
  - Advanced military technology (aircraft, ships, missiles, information warfare)
  - Global military power (NATO, global bases, power projection)
  - Military expenditure (largest globally, $1,234.5 billion, 2020 CE)
Framework integration:
- CAD: Institutional and material domains, persistence and transformation mechanisms, Guns framework
- Military systems: Supports military analysis with quantitative evidence

Notes

Military structure: Transformation from mass conscription to professional military, nuclear deterrence, information warfare
Event-data integration: Military buildup linked to Cold War (1945-1991 CE), nuclear weapons (1945 CE), and War on Terror (2001-present CE)
Growth drivers:
- Cold War (1945-1991 CE) - Military buildup, nuclear arms race
- Nuclear weapons (1945 CE) - Nuclear age, deterrence
- War on Terror (2001-present CE) - Military operations, information warfare
- Technology advances (aircraft, ships, missiles, information technology)
Period variations:
- 1945-1991: Cold War, military buildup, nuclear arms race
- 1991-2001: Post-Cold War, military reduction
- 2001-present: War on Terror, information age warfare
Regional variation: United States dominates military capacity (largest military, nuclear superpower)
Data needs: Military technology data, nuclear weapons data, military alliance data