https://en.wikipedia.org/wiki/United_States_military_casualties_of_war
| Rank | War | Years | Deaths | Deaths per day | U.S. population in first year of war | Deaths as percentage of population |
|---|---|---|---|---|---|---|
| 1 | American Civil War | 1861–65 | 655,000 (est.)(U.S./Confederate)[86] | 449 | 31,443,000 | 2.083% (1860) |
| 2 | World War II | 1941–45 | 405,399 | 297 | 133,402,000 | 0.307% (1940) |
| 3 | World War I | 1917–18 | 116,516 | 200 | 103,268,000 | 0.110% (1920) |
| 4 | Vietnam War | 1961–75 | 58,209 | 11 | 179,323,175 | 0.032% (1970) |
| 5 | Korean War | 1950–53 | 36,574 | 30 | 151,325,000 | 0.024% (1950) |
| 6 | American Revolutionary War | 1775–83 | 25,000 | 11 | 2,500,000 | 1.00% (1780) |
| 7 | War of 1812 | 1812–15 | 15,000 | 15 | 8,000,000 | 0.207% (1810) |
| 8 | Mexican–American War | 1846–48 | 13,283 | 29 | 21,406,000 | 0.057% (1850) |
| 9 | Iraq War | 2003–11 | 4,576 | 2 | 294,043,000 | 0.002% (2010) |
| 10 | Philippine–American War | 1899–1902 | 4,196 | 3.8 | 72,129,001 | 0.006% (1900) |
| 11 | Spanish–American War | 1898 | 2,246 | 9.6 | 62,022,250 | 0.004% (1890) |
| 12 | War in Afghanistan | 2001–present | 2,216 | 0.36 | 294,043,000 | 0.001% (2010) |