| | Years of War Spending | Peak Year of War Spending |
|---|
| Total Military Cost of War in Millions/Billions of Dollars | War Cost % GDP in Peak Year of War | Total Defense % GDP in Peak Year of War |
|---|
American Revolution
Current Year $
Constant FY2008$ | 1775-1783
101 million
1,825 million | |
| NA | NA |
War of 1812
Current Year $
Constant FY2008$ | 1812-1815
90 million
1,177 million | 1813 |
| 2.2% | 2.7% |
Mexican War
Current Year $
Constant FY2008$ | 1846-1849
71 million
1,801 million | 1847 |
| 1.4% | 1.9% |
Civil War: Union
Current Year $
Constant FY2008$ | 1861-1865
3,183 million
45,199 million | 1865 |
| 11.3% | 11.7% |
Civil War: Confederacy
Current Year $
Constant FY2008$ | 1861-1865
1,000 million
15,244 million | |
| NA | NA |
Spanish American War
Current Year $
Constant FY2008$ | 1898-1899
283 million
6,848 million | 1899 |
| 1.1% | 1.5% |
World War I
Current Year $
Constant FY2008$ | 1917-1921
20 billion
253 billion | 1919 |
| 13.6% | 14.1% |
World War II
Current Year $
Constant FY2008$ | 1941-1945
296 billion
4,114 billion | 1945 |
| 35.8% | 37.5% |
Korea
Current Year $
Constant FY2008$ | 1950-1953
30 billion
320 billion | 1952 |
| 4.2% | 13.2% |
Vietnam
Current Year $
Constant FY2008$ | 1965-1975
111 billion
686 billion | 1968 |
| 2.3% | 9.5% |
Persian Gulf War /a/
Current Year $
Constant FY2008$ | 1990-1991
61 billion
96 billion | 1991 |
| 0.3% | 4.6% |
Iraq /b/
Current Year $
Constant FY2008$ | 2003-Present
616 billion
648 billion | 2008 |
| 1.0% | 4.2% |
Afghanistan/GWOT /b,c/
Current Year $
Constant FY2008$ | 2001-Present
159 billion
171 billion | 2007 |
| 0.3% | 4.0% |
Post-9/11 Domestic Security (Operation Noble Eagle) /b/
Current Year $
Constant FY2008$ | 2001-Present
28 billion
33 billion | 2003 |
| 0.1% | 3.7% |
Total Post-9/11--Iraq, Afghanistan/GWOT, ONE /d/
Current Year $
Constant FY2008$ | 2001-Present
809 billion
859 billion | 2008 |
| 1.2% | 4.2% |
