Different perspectives on the Cold War

Whereas during the Second World War the United States and the Soviet Union had been Allies in the fight against Nazi Germany, after the war the relation between the two countries quickly degenerated into mutual distrust, military and nuclear build-up, and Cold War. The Cold War was a continuing state of political and military tension between the powers of the Western world, led by the USA and the Communist world, led by the USSR. It lasted from approximately 1945 till 1991.