The document provides an overview of the Cold War between 1945-1991, including key events and figures. It discusses how the Cold War began due to tensions between the US and Soviet Union following WWII over the rebuilding of Europe. Major events of the Cold War included the Marshall Plan, Berlin Airlift, NATO and Warsaw Pact alliances, Korean War, Cuban Missile Crisis, Vietnam War, and Soviet invasion of Afghanistan. The document also examines fears of nuclear war and what might have happened if the Cold War turned hot. It concludes by discussing Mikhail Gorbachev's reforms in the Soviet Union in the 1980s and the subsequent collapse of the USSR in 1991, bringing an end to the Cold War.