Tension between the United States and the Soviet Union was apparent. It stemmed from ideological, political and economic factors which led to shifts in the cooperation they initially had and changed it to a bitter rivalry in theory. The United States began to have fears and an unsure feeling about the communism that was present within the USSR led by Joseph Stalin and created an obstacle regarding friendly relations with the west. Although, the US and USSR were allies due to the shared hatred for Nazi Germany, tensions arose.
