100,000
Platt Amendment Foraker Act
The most Americans died in Vietnam which was also the longest war that America was involved in.
2000
60 thousandMacLeod, Roy M. Science and the Pacific War: science and survival in the Pacific. Dordrecht, The Netherlands: Kluwer Academic Pub, 2000.
The cold war was not a war; it was a military stand-off (no war). Americans died to operational causes (accidents).
about 4 million soldiers died during the Vietnam war
Roughly 116,000 Americans died in World War I.
The answer to your question is that the civil war was fought between Americans, while in other wars, they were fought between America and other countries so twice as many Americans died.
The prepositional phrase in the sentence "About 720,000 Americans died during the Civil War" is "during the Civil War." This phrase indicates the time frame in which the event (the deaths of Americans) occurred.
The number of Americans who died in combat is 2,757,196.
many people died don forget the cost of the war