Cold War: A period of geopolitical tension between the United States and Soviet Union after World War II, characterized by ideological conflicts and competition for influence.
Containment: US policy during the Cold War aimed at preventing the spread of communism by using various strategies, including military interventions.
Domino Theory: The belief that if one country fell to communism, neighboring countries would also fall like dominos. This theory influenced US interventions during the Cold War era.