In 1945, Harry S Truman became president of the USA, determined to confront Communism. He is reported to have told his advisers:
The Russians only understand one language - how many armies have you got? I'm tired of babying the Soviets.Harry S Truman, 1945
This was not the only cause of trouble. Historians believed that the wartime alliance between the Soviet Union and America was also wrecked by the huge differences between the two countries in:
The collapse of the wartime alliance led to a Cold War between the two superpowers.