What events turned the soviet union from an ally to a competitor

the Soviet Union was a great ally to the United States and England during the war but it turned into an enemy when the nations had to set the new limits after the war. The first big problem was Berlin since the Soviet Union wanted the total control of the city and imposed a blockade but the western countries supplied western Berlin with 12,941 ton of necessities a day.

the heightened emotion and nature images.