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Operation Downfall was the name for the planned invasion of the Japanese home islands during WW2. In OTL it was never implemented as Japan was forced into surrender by the atomic bombs dropped on Hiroshima and Nagasaki.
My questions are simple. Do you think that this plan could have succeeded? And if successful to what degree? How might the Cold War be altered as a consequence?
This scenario possibly requires the POD of an unsuccessful or delayed Manhattan Project to eliminate the nuclear option used in OTL.