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Off the top of my head, I think that Hitler would still start his crap in Europe, and the US would still give lend lease aid, but without an alliance with Japan I don't see a scenario with Hitler declaring war on the US during the fighting with Britain, Russia, and assorted others. I'd think America would provide materiel support but not actually fight.

With Japan, however, they are probably still going to attack America. Without a war with Germany, however, all of America's military might will be focused on the Japanese. This will not end well for Japan. In fact, I can see the US reaching the home islands in '43 or early '44. At this point in time, I would doubt the existance of a working nuclear weapon in US hands. That being the case, would we invade the home islands? With no garrison in Europe and no British support (Japan certainly would have gone after British territories, but they would likely have their hands too full with Germany to do much of anything about it), and no possibility of using nuclear weapons against military formations, how does this invasion look? Sure, America wins, but how quickly and at what cost?

As a second question, with the British unable to react to Japanese attacks against their territories in the Pacific, what would the Australians and New Zealanders do? Would they focus their efforts on helping out Britain in the fight against Germany, or would they do what they could for Britain's Pacific territories in the fight against Japan, operating very closely with the Americans? Australia and New Zealand won't be directly threatened by Japan, so I could see this going either way.

What would India do? Without British support and with Japan screwing around successfully in Southeast Asia early in the war before America stood up strait and started beating their faces in, would they raise more military units so as to oppose Japan themselves? Could we see a legendary Indian effort in the Pacific War similar to the ANZAC legend of the World Wars? What would this mean for Indian politics after the war?
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