| The following is a listing of U.S. casualties in the various conflicts that have been a part of the country's history.
The following numbers reflect only reported war deaths and exclude those wounded and/or missing.
The Civil War maintains the highest American casualty total of any conflict.
In its first 100 years of existence, over 683,000 Americans lost their lives, with the Civil War accounting for 623,026 of that total (91.2%).
Comparatively, in the next 100 years, a further 626,000 Americans died through two World Wars and several more regional conflicts (World War 2 representing 65% of that total).
Using this comparison, the Civil War might very well be the most costly war that America has ever fought.
| Conflict | Span | Casualties |
| Revolutionary War
| 1775-1783
| 25,000 |
| Northwest Indian War
| 1785-1795
| 1,056 |
| Quasi-War
| 1798-1800
| 514 |
| War of 1812
| 1812-1815
| 20,000 |
| 1st Seminole War
| 1817-1818
| 36 |
| Black Hawk War
| 1832
| 305 |
| 2nd Seminole War
| 1835-1842
| 1,535 |
| Mexican-American War
| 1846-1848
| 13,283 |
| 3rd Seminole War
| 1855-1858
| 26 |
| Civil War
| 1861-1865
| 625,000 |
| Indian Wars
| 1865-1898
| 919 |
| Great Sioux War
| 1875-1877
| 314 |
| Spanish-America War
| 1898
| 2,446 |
| Philippine-American War
| 1898-1913
| 4,196 |
| Boxer Rebellion
| 1900-1901
| 131 |
| Mexican Revolution
| 1914-1919
| 35 |
| Haiti Occupation
| 1915-1934
| 148 |
| World War 1
| 1917-1918
| 116,516 |
| North Russia Campaign
| 1918-1920
| 424 |
| American Exp. Force Siberia
| 1918-1920
| 328 |
| Nicaragua Occupation
| 1927-1933
| 48 |
| World War 2
| 1941-1945
| 405,399 |
| Korean War
| 1950-1953
| 36,516 |
| Vietnam War
| 1955-1975
| 58,209 |
| El Salvador Civil War
| 1980-1992
| 37 |
| Beirut
| 1982-1984
| 266 |
| Grenada
| 1983
| 19 |
| Panama
| 1989
| 40 |
| Gulf War
| 1990-1991
| 258 |
| Operation Provide Comfort
| 1991-1996
| 19 |
| Somalia Intervention
| 1992-1995
| 43 |
| Bosnia
| 1995-2004
| 12 |
| NATO Air Campaign Yugoslavia
| 1999
| 20 |
| Afghanistan (ongoing)
| 2001-
| 1,893(02/2012) |
| Iraq
| 2003-2011
| 4,484 |
In Flanders Field
John McCrae
In Flanders fields the poppies blow
Between the crosses, row on row,
That mark our place; and in the sky
The larks, still bravely singing, fly
Scarce heard amid the guns below.
We are the Dead. Short days ago
We lived, felt dawn, saw sunset glow,
Loved and were loved, and now we lie
In Flanders fields.
Take up our quarrel with the foe:
To you from failing hands we throw
The torch; be yours to hold it high.
If ye break faith with us who die
We shall not sleep, though poppies grow
In Flanders fields.
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