COLD WAR 

In 1945, the United States and Soviet Union were allies in World War II but after the war however the U.S. and the USSR became  enemies in a power struggle to be who was the best.The U.S and the U.S.S.R never really fought they just used Military threats and created tension using propaganda. The U.S and the U.S.S.R both wanted to be the strongest Nation and spread their political ideology.