Foreign policy: Foreign policy refers to a government's strategies and actions towards other countries. It includes decisions related to diplomacy, trade, defense, and international relations.
Containment: Containment was a Cold War strategy adopted by the United States that aimed to prevent the spread of communism. It involved using military force or political influence to limit Soviet expansion.
Domino theory: The domino theory was a belief held by American policymakers during the Cold War that if one country fell under communist control, neighboring countries would also fall like dominos. This theory influenced U.S.'s involvement in both Korea and Vietnam Wars as it sought to prevent communism from spreading further.