In today's lecture we looked at the Cold War's early, very dangerous years (1943-1962). As these dates suggest, the Cold War began in World War II, when suspicions between the Soviet Union and the U.S. were ignited by wartime strategy of the Big Three. Other sources of the Cold War are discussed, as well as its domestic impact upon the United States during the late 1940s and early 1950s. Lecture 22, The Cold War: Dangerous Years