USA HISTORY

Detailed explanation-1: -The primary evidence for the domino theory is the spread of communist rule in three Southeast Asian countries in 1975, following the communist takeover of Vietnam: South Vietnam (by the Viet Cong), Laos (by the Pathet Lao), and Cambodia (by the Khmer Rouge).

Detailed explanation-2: -What Was the Domino Theory? By 1950, U.S. foreign policy officials had firmly embraced the idea that the fall of Indochina to communism would lead rapidly to the collapse of other nations in Southeast Asia.

Detailed explanation-3: -domino theory, also called domino effect, theory adopted in U.S. foreign policy after World War II according to which the “fall” of a noncommunist state to communism would precipitate the fall of noncommunist governments in neighbouring states.

Detailed explanation-4: -On April 7, 1954, President Dwight Eisenhower answered a press conference reporter’s question about the impending defeat of the French in Indochina with the first articulation of what would become known as “The Domino Theory.” The theory would drive the escalation of the Vietnam War over the next two decades.