This document contains summaries of key events and questions from the Cold War era: 1) It outlines the origins of the Cold War following World War 2, including the breakdown of relations between the US and USSR and Soviet expansion into Eastern Europe behind the Iron Curtain. 2) It asks how the USSR gained control of Eastern Europe by 1948 and how the US reacted to Soviet expansionism. 3) It summarizes the Cuban Revolution, the US reaction including the failed Bay of Pigs invasion, and the Cuban Missile Crisis between the US and USSR, including the roles of Khrushchev and Kennedy and the resolution.