World War II had the greatest number of casualties caused directly and indirectly by war. The death toll is listed at 84,589,300 for all countries jointly that were involved in the war. The American Civil War had the largest number of United States casualties, listed at 625,000.
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WWII is often called "The Big One" because it is, by far, the largest war ever fought. It involved the greatest number of countries, it spread over the largest amount of territory, it was waged by the largest number of men and it had the largest number of casualties of any war ever. Michael Montagne
1.1 million German casualties in WW1.
The Federal Army with 12,447 casualties, including prisoners and missing.
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