World War II was the bloodiest war in the U.S. History.
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what is the name of the war that was the bloodiest single day of fighting in american history
The American Civil War
September 17, 1862, the battle of Antietam, with 32,719 casualties and 3,654 dead was the single bloodiest day in American history.
The bloodiest battle of the Civil War was Antietam, and the Union won the battle. It was fought in 3 phases, the cornfield, the sunken road, and the bridge.
The firing on Fort Sumter.The civil war stated because if so much tension and then the union had a fort down south and it was attacked and the north declared war on the south wich led to the most bloodiest war in us history