Its about even actually between both World wars and the civil war. The civil war was a much higher percentage of the population though. The thing with world war two is that if the US had not intervened then england more then likely would have fallen and those troops would have moved to the eastern front and fought Russia. But at this point we just get into what-ifs. Also the US fought Japan pretty much by ourselves. I am not an expert on those wars, our civil war i am, i know pretty much everything about that one.
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