The document provides background information on the early Cold War period from 1947 to 1970. It discusses key events like the Truman Doctrine and Marshall Plan that established the US policy of containment of communism. It also covers the establishment of military alliances like NATO and the Warsaw Pact, proxy wars in Korea and Vietnam, and crises over places like Berlin, Cuba, and Czechoslovakia. The arms race between the US and USSR is examined, as well as the emergence of the Non-Aligned Movement led by countries seeking to avoid alignment with either superpower.