BoDog said:
Seriously? Its actually a pretty easy scenario to imagine.
The Germans would have taken if not decimated Russia at an alarmingly huge military expense to the point where they wouldn't have much left to defend the motherland from the invading Americans and Brits (nevermind the constant carpet bombing at the expense of the German people and infrastructure).
There would be no Russia as a major player on the world stage. No Soviet Bloc and therefore no cold war.
This is seriously a pretty easy scenario to imagine that it is pure fantasy from both political and military points. So, the US would just "stop" and let Germany finish Russia - in what world could the US and Britain just "stop" for a while from a political position. And if Germany had finished off Russia they would have been a juggernaut that the US would have been at a serious disadvantage to challenge. Once Germany defeated (and that's an unrealistic huge if), they would have then had 4x the men and materiel to go against the western allies - not to mention they would have then had access to the massive natural resources of Russia (oil, metal ores, timber, farmland) and been able to place (or utilize captured) factories out of reach of US bombers (and again not having to allocate air power to the eastern front so available to counter the allied bombers).
And how does this dovetail in with the US war in the pacific. The US public would never have had the stomach for the unbelievable loss of life to take on both Germany and Japan single handed. The invasion of mainland Japan was avert significantly with the help of Russia declaring war on Japan in early August 1945 - without that, Japan likely continues and forces a mainland invasion.
Could go on in detail, but please pull out your notes from that "any college history class" and give details on how your scenario could have been accomplished.