This document discusses the differences between communism and democracy and provides examples of conflicts between communist and democratic nations during the Cold War. It describes how communism spread in China and North Korea's attempted takeover of South Korea, leading to the Korean War. It also discusses the Vietnam War and the US's goal of preventing further communist expansion. The document introduces the "Domino Theory" which was the US belief that communism spreading to one Asian nation would lead to others falling as well, and the policy of "Containment" to stop communism from spreading through military force if needed.