The document provides an overview of the origins and key events of the Cold War between the United States and Soviet Union from 1945 to the early 1960s. It discusses the ideological differences that emerged after WWII, the Soviet domination of Eastern Europe, and conflicts in areas like Germany, China, and Korea that increased tensions between the two superpowers as they engaged in espionage, arms buildups, and proxy wars. Covert actions by the CIA and incidents like the U-2 spy plane shooting down added to Cold War tensions through the late 1950s.