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What would have happened if, like after WWI, the US got so disgusted with European warmongering that they went back to pursuing an isolationist policy after WWII? A bit ASB maybe but what would happen?
Personally, I see much more focus on European intergration as a defense against the Soviets, and possibly the emergence of an EU superpower, militarily as well as economically. Or the entire continent could collapse in a heap and be steamrolled by the commies