This document discusses the origins and key events of the early Cold War between the United States and Soviet Union. It covers Winston Churchill coining the term "Iron Curtain" in 1946 to describe the boundary between western and eastern Europe. It also outlines President Truman establishing the Truman Doctrine in 1947 to provide aid to countries resisting communism, and the Marshall Plan that same year that gave $20 billion in aid to help rebuild Western Europe. Finally, it mentions the formation of NATO in 1949 and the Warsaw Pact in 1955 as military alliances that solidified the division between the capitalist and communist blocs during the Cold War.