Answer:-
The Domino Theory was a Cold War-era belief that if one country fell to communism, neighboring countries would follow, like a row of falling dominoes. First introduced by U.S. President Dwight D. Eisenhower in 1954, it was used to justify American involvement in conflicts like the Vietnam War. The idea was that stopping communism in one place would prevent its spread worldwide. However, after the Vietnam War, the theory lost credibility as communism did not spread as widely as feared. While influential in shaping U.S. foreign policy, it is now seen as an oversimplified view of global political dynamics.
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