Despite deep-seated mistrust and hostility between the Soviet Union and the Western democracies, Nazi Germany's invasion of the Soviet Union in June 1941 created an instant alliance between the Soviets and the two greatest powers in what the Soviet leaders had long called the "imperialist camp": Britain and the United States.
the ideological conflict between both the United States and the Soviet Union, the emergence of nuclear weapons, and the fear of communism in the United States.
