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Let's say, for whatever reason, the Trinity test gets delayed and the Bomb can't be made ready on time, Operation Downfall (a.k.a. the invasion of the Home Islands) isn't scrapped.
I'm assuming the Soviets, having recently just declared war on the Japanese are going to chip in, but my question is what will happen to Korea post-war? Since the Americans will be focused on conquering the Home Islands, will the Soviets instead make a drive to the peninsula via Manchuria?