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A few questions
What would it take for the USA to stay out of world war 2? How far back would the PoD be? A stronger isolationist faction within the USA is an obvious suggestion but I'm not to familiar with US history of the period.
Is it perhaps the Empire of Japan that was the factor that lead to their entry (Not just within the context of Pearl Harbour) Would they ever go to war with Nazi Germany but not the empire of Japan?