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 major flashpoints like the Berlin Blockade, Korean War, and U-2 incident that increased tensions between the two superpowers. Covert operations and arms races further escalated hostilities as the Cold War expanded globally during this time period.