The Cold War was a period of diplomatic hostility between the United States and Soviet Union from 1945-1991 without direct armed conflict. Key events included the spread of communism in Eastern Europe and Asia, the Berlin Blockade, the Korean War, Cuban Missile Crisis, and arms race between the two superpowers. The Cold War ended with the collapse of the Soviet Union in the late 1980s and early 1990s as its economy struggled and people pushed for political change.