Which war climed the most lives?

Answer 1

American Revolution (1775–1783) Total servicemembers 217,000 Battle deaths 4,435 Non mortal woundings 6,188 War of 1812 (1812–1815) Total servicemembers 286,730 Battle deaths 2,260 Nonmortal woundings 4,505 Indian Wars (approx. 1817–1898) Total servicemembers 106,0001 Battle deaths 1,0001 Mexican War (1846–1848)   Total servicemembers 78,718 Battle deaths 1,733 Other deaths in service (nontheater) 11,550 Nonmortal woundings 4,152 Civil War (1861–1865)   Total servicemembers (Union) 2,213,363 Battle deaths (Union) 140,414 Other deaths in service (nontheater) (Union) 224,097 Nonmortal woundings (Union) 281,881 Total servicemembers (Conf.) 1,050,000 Battle deaths (Conf.) 74,524 Other deaths in service (nontheater) (Conf.) 59,297 Nonmortal woundings (Conf.) unknown Spanish-American War (1898–1902)   Total servicemembers 306,760 Battle deaths 385 Other deaths in service (nontheater) 2,061 Nonmortal woundings 1,662 World War I (1917–1918) Total servicemembers 4,734,991 Battle deaths 53,402 Other deaths in service (nontheater) 63,114 Nonmortal woundings 204,002 Living veterans fewer than 500 World War II (1940–1945) Total servicemembers 16,112,566 Battle deaths 291,557 Other deaths in service (nontheater) 113,842 Nonmortal woundings 671,846 Living veterans 4,762,000 Korean War (1950–1953) Total servicemembers 5,720,000 Serving in-theater 1,789,000 Battle deaths 33,741 Other deaths in service (theater) 2,827 Other deaths in service (nontheater) 17,730 Nonmortal woundings 103,284 Living veterans 3,734,000 Vietnam War (1964–1975) Total servicemembers 8,744,000 Serving in-theater 3,403,000 Battle deaths 47,410 Other deaths in service (theater) 10,789 Other deaths in service (nontheater) 32,000 Nonmortal woundings 153,303 Living veterans 8,295,000 Gulf War (1990–1991) Total servicemembers 2,225,000 Serving in-theater 665,476 Battle deaths 147 Other deaths in service (theater) 382 Other deaths in service (nontheater) 1,565 Nonmortal woundings 467 Living veterans 1,852,000 Operation Enduring Freedom (October, 2001- present) (Afghanistan/Pakistan) Battle Deaths--373 Wounded--1,096 Operation Iraqi Freedom (March 2003 - present) Total Deaths--3,391 and counting KIA--2,761 Wounded--23,924 US civilian deaths-contractors--147 Non-hostile deaths--585