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I'm not sure if this has ever been brought up, if it has I apologize.
What if, instead of attacking Pearl Harbor, the Japanese figure out that no matter how badly Roosevelt wants to get involved he can't without Congress? U-Boat attacks on US ships bring protests but no action. The US does embargo oil and scrap iron to Japan to try and force them out of China.
What if the military decides to take the NEI and various UK possessions but make no attacks on US territories (the Philippines, Guam, Midway, Wake, etc.).
Ignoring the huge US buildup in the Philippines is dangerous but if Roosevelt is hamstrung by Congress it might work.
Obviously this goes against the Japanese military mindset but, is there a chance Japan can get the oil, rubber and other items she needs without provoking a war with the US?