The document provides an overview of the start of the Cold War between the United States and Soviet Union after World War II. It discusses key events like the Iron Curtain speech, the Truman Doctrine and Marshall Plan that established US policies of containment of communism. It also summarizes the formation of military alliances like NATO and the Warsaw Pact, proxy wars, the arms race and space race between the two superpowers during this early period of the Cold War. Debate questions are included about different perspectives on who was responsible for the escalation of tensions.