(A) ** Civil War
(B) World War II
(C) World War I
(D) Vietnam War
EXPLANATIONS BELOW
Concept note-1: -The Civil War was the deadliest of all American wars. No one disagrees with that. But how many died has long been a matter of debate. For more than a century, the most-accepted estimate was about 620, 000 dead.
Concept note-2: -The American Civil War is the conflict with the largest number of American military fatalities in history. In fact, the Civil War’s death toll is comparable to all other major wars combined, the deadliest of which were the World Wars, which have a combined death toll of more than 520, 000 American fatalities.
Concept note-3: -Twice as many Civil War soldiers died from disease as from battle wounds, the result in considerable measure of poor sanitation in an era that created mass armies that did not yet understand the transmission of infectious diseases like typhoid, typhus, and dysentery.
Concept note-4: -The Taiping Rebellion, which broke out in 1850, would come to be the bloodiest civil war in human history. Historians estimate it may have claimed up to 30 million lives. Yet, unlike the Chinese Civil War, it is largely forgotten in the West, despite the involvement of French, British, and American officers.