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World War 2, September 1939 to September 1945 was the biggest war in history. It was fought over the entire planet, and involved tens of millions of people and millions died in it.

The American Civil (1861 to 1865) was the worst war in American history, because it was Americans (Union soldiers) killing Americans (Confederate Soldiers), but, it was not the biggest war in the history of the planet.

WW2 was by far and away, the biggest war in the history of the human race.

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13y ago

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