What factors led the wartime alliance between the united states and the soviet union to disintegrate into the cold war

The wartime alliance between the Soviet Union and the United States sought to work against an immediate threat to Europe and, eventually, the world: The axis powers. After the war, it became clear that the Soviets under Joseph Stalin were just as maddening, and the United States (as well as NATO) began to consider communism to be a global threat to democracy.