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You can't actually win such large scale wars as the frontline of the conflict, WWI and WWII were just races about who collapses first and the one who collapses later "wins".
America won those conflicts because they played a backseat role in the war and their own land was untouched, they were barely anything more than an investment for them (which their economy really needed) and when they had to actually face a serious enemy they just invented a cheat code and forced them into submission