Because Wilson could not get enough support from senate.
The Allied's forces strategy was to keep Russia from being conquered. This was for if Russia was to be taken by Germany then they would immediately try to conquer Britain too. There was a conflict though when they had all the dictators meet. This was due that Josef Stalin wanted to go full on attack on Germany since they were getting obliterated by the Germans. Churchill wanted to, however, attack in small groups as he feared they would be easily conquered. This was later resolved by them trying to cooperate and meet eye to eye by meeting up several times during the war to discuss battle plans. Most important being that Franklin Roosevelt came to Yalta in an attempt to have the Russians help end the war by joining the attack of Japan which the Russians accepted only after they accepted to give Russia <span>control over large areas of Europe. I hope this helps but sorry in advance if it doesn't.</span>
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