[Nonfiction]

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If the U.S. doesn't join WWII...there is certainly a non-zero possibility that the USSR would have won the cold war (control of Japan) and, of course, a non-zero chance that we would all be speaking German right now.

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Soviets wouldn't have control of Japan, they never would have even fought. Cold War would be Japan + China + Southeast Asia and maybe India vs USSR + Occupied Europe vs US + UK and maybe France/Italy depending on if UK can D-Day by itself. Due to their huge borders and opposed ideologies Japan and Soviets would be natural enemies, so Cold War would likely be weak US + powerful Japan vs powerful Soviets