This study reveals that U.S. military forces were directly responsible for about 10 to 15 million deaths during the Korean and Vietnam Wars and the two Iraq Wars. The Korean War also includes Chinese deaths while the Vietnam War also includes fatalities in Cambodia and Laos.
The American public probably is not aware of these numbers and knows even less about the proxy wars for which the United States is also responsible. In the latter wars there were between nine and 14 million deaths in Afghanistan, Angola, Democratic Republic of the Congo, East Timor, Guatemala, Indonesia, Pakistan and Sudan.
The overall conclusion reached is that the United States most likely has been responsible since WWII for the deaths of between 20 and 30 million people in wars and conflicts scattered over the world.US Has Killed More Than 20 Million In 37 Nations Since WWII – PopularResistance.Org