The document summarizes key events and policies of the Cold War era: 1) The Truman Doctrine and Marshall Plan were created to contain the spread of communism in Europe through economic and military aid. 2) The Berlin Airlift resupplied West Berlin after the Soviet Union blocked land access, and NATO was formed as a Western military alliance against the Soviet-led Warsaw Pact. 3) Conflicts arose over national borders and influence, such as the Korean War, Hungarian Uprising, and Soviet invasion of Afghanistan. 4) Arms races and crises increased tensions like the Cuban Missile Crisis, while detente policies briefly eased tensions.