The document summarizes key events and developments of the Cold War between 1985-1991. It describes the Cold War as a state of political hostility between the US/NATO and the Soviet Union/satellite states. It discusses post-WWII conferences at Yalta and Potsdam that divided Germany into East and West and established Soviet control over Eastern Europe. It also outlines the Truman Doctrine providing aid to Greece and Turkey, the Marshall Plan rebuilding Western Europe, the Berlin Wall dividing the city, and space and arms races between the two superpowers. Mao Zedong's rule in China and conflicts in Korea and Vietnam are also summarized.