The Cold War began in 1945 after World War 2 and lasted until 1991. It was a period of geopolitical tension between the Soviet Union and its satellite states (the Eastern Bloc), and the United States and its allies. Key events in the early Cold War from 1945-1952 under President Truman include the Truman Doctrine providing aid to Turkey and Greece to contain communism in Europe, the Marshall Plan to rebuild Western Europe, the 1948-1949 Berlin Airlift when the US flew supplies into West Berlin after Soviet blockades, and the 1950-1953 Korean War where US troops fought against communist North Korea and China.