re: What would’ve happened if Britain had surrendered in WWII?

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And interesting alternate strategy in this scenario (are we assuming japan still attacks US?) 
Would be to let the Germans wear themselves thin fighting the commies while we are fighting the japs, then attack a depleted Germany once they have defeated the Soviets and Japan taps out. 

Because to be perfectly honest, the Soviets did most of the heavy lifting in WW2 against the Germans. 

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In the two years before Pearl Harbor, Germany gave every appearance of being unstoppable. It was dicy to assume we could afford to let them punch themselves out. Meanwhile Japan made us mad and achieved some spectacular early successes, but geography imposed strict limits on how much they could ultimately do to us. A victorious Germany would have been an existential threat to the United States.

By WWII the Soviets still gave lip service to global revolution, but were far more interested in consolidating and holding on to the status quo. The Nazis really intended to conquer the world in a multigenerational campaign.