The most Americans died in Vietnam which was also the longest war that America was involved in.
Both sides, North and South, were considered Americans. So the total number of deaths were all Americans.
probably the Vietnam war
The most US soldiers died during the American Civil War. That is because Americans were fighting on both sides.
Beacause there were americans on both sides... idiot
It was the biggest blood shed on American soil.
Infection
Because Americans were fighting Americans, the US Civil War (1861-1865) took the most American lives, about 800,000 men. WWII took the second most at around 400,000 men; WWI about 116,000 men; Korea 33,000; Vietnam 58,000 men.
diseases
New guns and weapons
The Wilderness.
I'm not finding more recent statistics, but according to this: "Most Americans die in hospitals (63 percent), and another 17 percent die in institutional settings such as long-term care facilities (Foley, 1995; Isaacs & Knickman, 1997)