Mr. Mundt: Did you draft or participate in draftng, parts of the Yalta Agreement? Mr. Hiss: I think it is accurate and not an immodest statement to say that I did to some extent, yes.
There was nothing America or the UK could have done to keep the Red Army out of Eastern Europe - Yalta or no Yalta.
Remember, Japan was still fighting us hard in the Pacific - we only engaged a small number of her military in the Island hop war. Also Eastern Europe was not well liked by the Americans - most of Eastern European countries were members of the Axis powers - no American cared to risk their lives to save Hilter's buddies from the Soviets' wrath.
The only nations we really cared for in the East were Poland and the Czech part of Czechoslovakia (the Slovaks were Nazi allies). That is the historical fact without the modern revisionist spin.