In fairness to FDR, he only sold out to Stalin because Churchill tricked him into. Churchill screwed over the U.S. in a major way.
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Churchill wanted the Godless Bolsheviks to annex eastern Poland up to the Curzon line?
I'm not saying he wanted it, but he was willing to give up almost anything to the Russians for them for the Russian to present a string Eastern front to Germans. The thing is, the Russian had no choice. The U.S. and U.K. should have had all the leverage. What was Stalin going to do, retreat into Siberia? The reality, Churchill was a terrible negotiator and gave away everything. Hitler saved Russia, by the way.