The Cold War lasted from 1945-1991 between the United States and the Soviet Union. During this time, communism spread to countries like Russia, China, Korea, and Cuba. The two superpowers engaged in proxy wars and an arms race without direct conflict. Key events included the Berlin Blockade, Cuban Missile Crisis, and Vietnam War. Technological developments in weapons and space further escalated tensions until the Soviet Union collapsed in the late 1980s.