Answer:
The Yalta Conference of the Big Three - the USA, Britain and the Soviet Union -, held in February 1945, defined the rules and many outcomes of the postwar world. Many people in the USA critized president F.D. Roosevelt for the large concessions made to Soviet top leader Joseph Stalin. One of the common complaints about Yalta is that it sanctioned an Europe and an Asia divided into spheres of influence, which guaranteed the USSR enormous territorial, geopolitical and political gains.
The Soviet Union would be able to maintain its huge army in the countries of Eastern Europe liberated from the Nazi occupation, though it took the compromise to allow free elections in them. That promise was not fully kept or was not kept at all, because Soviet authorities maneuvered to help local communist parties to reach power, or the elections were manipulated. The new Eastern European governments had to be friendly to Moscow, it was agreed.
The Soviet compromise to help the USA in the fight against the Japanese in the Far East permitted an increase influence of Moscow in that part of the world, it sowed the seeds of the future division of Korea.
So, the American-Soviet postwar relations had to include the factor of the Yalta agreements among the great powers, even despite the Cold War.
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