It depends on what you mean by same. World War 2 and the Civil War were not the same war and they were not for the same causes like slavery. So to me they are nothing alike.
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It wasn't, it was a precursor to World War 2.
World War I
625,000 Civil War (both sides USA) 116,516 WW1 416,800 WW2 36,516 Korea 58,209 Viet Nam
Because the German Air Force practiced dive bombing in Spain during their civil war.
fear of communism led to the supression of the civil liberties of some americans