Actually, the US might have taken a severe turn to the right. The right would have used any ceasefire as propaganda against liberals in the US, and the higher body count caused by a Soviet exit could have made Americans more receptive to this talk.
I do not think that the war would have lasted much longer than it did. Germany would have been nuked, and the German could have retaliated by using nerve gas. Then the Allied would have hit German with everything, and the German economy would have collapsed.
Weren't the American conservatives more so against war (non-interventionist) at the time?
The war would have gone on longer.
The soviets may have taken more territory (perhaps even leading to an American versus USSR war).
Germany may have secured peace with the Soviets, but still lost to the allies. Japan would have been stronger due to distracted resources and may not have stopped the US before it reached the mainland. (jets may have stopped Hiroshima and Nagasaki)
Germany may have secured peace with both the Soviets and the rest of the allies. The Cold War would have been a 3 way against the axis powers and the Soviets. Likely two sides would have sided against the other.
Anyhow, we could just have easily asked what if Operation Market Garden had succeeded? Perhaps the Cold War would have been hot, or perhaps it would have barely mattered at all.
