The "Domino Theory" suggests that political unrest in one country can destabilize neighbors and start a chain of events like the fall of a stack of dominoes.

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The Domino Theory was a popular belief during the Cold War that suggested if one country fell to communism or political unrest, its neighboring countries would also become unstable and eventually fall like a line of dominoes. This belief influenced US foreign policy and military interventions in Southeast Asia during the Vietnam War.

The "Domino Theory" Suggests That Political Unrest in One Country