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A lot has been written on a certain thread about Japan avoiding the war with the US during WWII. What I prepose is the opposite.
Your challenge is to make the Japanese Empire run headlong into a war with the USA in roughly the OTL timeframe, with no war raging in Europe for whatever reason (no Hitler, etc.).
How would it happen? How different would it be from OTL? What would be the consequences of a strictly USA-Japanese war?