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It was a six months trip across 2000 miles
Answer:
The reason that the wartime alliance between the United States and the Soviet Union unraveled is because the United States was against communism but the Stalin wasn't. All of the land occupied by the Soviet Red Army were controlled by communism and Stalin wanted to spread this into Western Europe and West Berlin.
Explanation:
At the Yalta conference, significant concessions were made to the Soviet Union because the Western Allies wanted Soviet Union to join them in their war against Japan. The Yalta Conference was held in the month of February of the year 1945. This conference was held between the British Prime Minister, the Soviet President and the President of the United States.