ok, so general consensus is that Hitler is eventually stopped in pretty much every scenario, just a question of how much he had at the end and if he didn't end up on fire in a ditch.
how about the East? let's say a straight Pacific War between the US and Japan (and China)? One could assume with the full weight of US industry brought to bare against Japan the war would have progressed more quickly. The US army would have clamored for landings in China. How different would history have been if there had been a prolonged US occupation of China? What if Mao never took over the country?