Knowra Domino theory Domino theory The geopolitical theory that one country’s fall to communism would cause neighboring countries to fall in succession. It became a major rationale for U.S. containment policy during the Cold War.
Cold War : A prolonged geopolitical rivalry between the United States and the Soviet Union and their respective allies, lasting roughly from 1947 to 1991. The theory developed within this rivalry and framed communist expansion as a strategic threat.
Vietnam War : A war from 1955 to 1975 involving North and South Vietnam, the United States, and other allies and communist states. U.S. leaders cited the danger of regional communist expansion to justify intervention.
Sino-Soviet split : The political and ideological rupture between the Soviet Union and the People’s Republic of China that emerged in the 1950s and deepened in the 1960s. Communist powers could be rivals, complicating the idea of a unified expansionary bloc.
Gulf of Tonkin Resolution : A 1964 U.S. congressional resolution that authorized President Lyndon B. Johnson to expand military action in Southeast Asia. It enabled escalation in Vietnam, where domino fears were a recurring policy justification.
Vietnamese boat people : Refugees who fled Vietnam by sea, especially after the communist victory in 1975. Their displacement reveals human consequences that a strategic chain-of-states metaphor leaves out.
Containment : A U.S. strategy of limiting the expansion of Soviet power and communism after World War II. The theory supplied a rationale for applying containment to conflicts in Asia.
Laos Civil War : A conflict from 1959 to 1975 between the Royal Lao Government and the communist Pathet Lao, entangled with the Vietnam War. Its outcome was often treated as part of the wider Southeast Asian chain feared by U.S. policymakers.
Vietnamese invasion of Cambodia : A 1978–1979 invasion that overthrew the Khmer Rouge government and installed a Vietnamese-backed regime in Cambodia. A communist state removed another communist government, defying a simple picture of coordinated expansion.
Vietnamization : The Nixon administration’s policy of transferring combat responsibilities in the Vietnam War to South Vietnamese forces while withdrawing U.S. troops. It sought to limit U.S. exposure while preserving South Vietnam against the feared regional consequences of defeat.
Third Indochina War : A series of conflicts from 1978 to 1991 involving Vietnam, Cambodia, China, and other regional actors. Its shifting alliances challenge the prediction that communist victories would produce a stable regional bloc.
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