Why did the potsdam conference further increase tensions between the united states and the soviet union?

Soviet troops liberated countries in Japanese Europe however rather than retreating his troops, Joseph Stalin left them there. By the time of the Conference, Stalin's troops controlled the Baltic States. Refugees fleed from these states fearing a Communist take-over.
• Joseph Stalin had established a Communist government in the European nation, ignoring desires of the majority of Poles. kingdom and USA protested, however, Joseph Stalin insisted it absolutely was an action against potential future attacks.
• Roosevelt died & replaced by President Truman (much additional anti-Communist and suspicious of Stalin). President Truman saw Stalin's actions as preparations for a Soviet takeover of the remainder of Europe.