Answer:
The Domino Effect was a theory in U.S. foreign policy after World War II stating that the "fall" of a noncommunist state to communism would precipitate the fall of noncommunist governments in neighboring states. President Harry S. Truman proposed the theory to justify sending military aid to Greece and Turkey in the 1940s.
Still, it became popular in the 1950s when President Dwight D. Eisenhower applied it to Southeast Asia, especially South Vietnam. The domino theory was one of the main arguments used in the Kennedy and Johnson administrations during the 1960s to justify increasing American military involvement in the Vietnam War.
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