Which US president first explained the domino theory, which was concerned with the expansion of communism in Southeast Asia?
History · High School · Wed Jan 13 2021
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The domino theory was first proposed by Pres. Harry S. Truman to justify sending military aid to Greece and Turkey in the 1940s but it became popular in the 1950s when Pres. Dwight D. Eisenhower applied it to Southeast Asia, especially South Vietnam.