Why did the potsdam conference furthter increase tensions between the u. s. and soviet union

The Potsdam Conference, 1945. The Big Three—Soviet leader Joseph Stalin, British Prime Minister Winston Churchill (replaced on July 26 by Prime Minister Clement Attlee), and U.S. President Harry Truman—met in Potsdam, Germany, from July 17 to August 2, 1945, to negotiate terms for the end of World War II.
A former federation of Communist republics occupying the northern half of Asia and part of eastern Europe; capital, Moscow. Full name Union of Soviet Socialist Republics.