The document summarizes key events of the Cold War between the United States and Soviet Union from 1945-1991. It describes the Yalta Conference which established divisions in Europe after WWII, the establishment of opposing military alliances NATO and Warsaw Pact, containment policies like the Truman Doctrine and Marshall Plan, tensions over divided post-war Germany including the Berlin Blockade, arms race including nuclear weapons, McCarthyism anti-communist crusade in the US, Korean War testing containment, Cuban Missile Crisis bringing the two sides closest to war.