World War One. Precise figures are impossible because of incomplete Russian totals from both world wars, but there is agreement that more soldiers died in World War One than in World War Two. Many millions of soldiers died in both world wars.
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For the US: the US Civil War (1861-1865) for the obvious reason we were fighting each other (Americans killing Americans); Southerners fighting Northerners.
around 600,000. It was the war with the most US casualties.
About 23,466 but most of them were form dieases or war wounds
It was most commonly known as "The Great War". It was the first time in history that more people died in war as a result of injuries than diseases.
60,000,000 died in world war 2
Yes. Because it brought terror to the whole world and most people died.