The Cold War lasted from 1945-1991 and was a state of political and military tension between the United States and the Soviet Union that stopped short of full-scale war. Key events included the Yalta and Potsdam conferences in 1945 where the postwar fate of Germany was decided, the Truman Doctrine of 1947 which aimed to contain the spread of communism with programs like the Marshall Plan, and the Berlin Wall being erected in 1961 to divide East and West Berlin. Other notable tensions included the nuclear and space arms races as both sides competed technologically, wars in Korea from 1950-1953 and Vietnam in the 1960s-70s as the US and USSR backed opposing sides, and leadership from figures such as Mao Zed