Who likened the perceived threat of communism in Southeast Asia to a row of falling dominoes?

 President Dwight D. Eisenhower

Explanation:

The National Security Council included the theory in a 1952 report on Indochina, and in April 1954, during the decisive battle between Viet Minh and French forces at Dien Bien Phu, President Dwight D. Eisenhower articulated it as the “falling domino” principle.

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