Which of the following best describes the concept of the Domino Theory?

The concept of the Domino Theory is best described as the belief that the fall of one nation to communism would lead to the fall of others. This idea was particularly significant during the Cold War, as it shaped U.S. foreign policy, particularly in Southeast Asia. The theory suggested that if one country in a region succumbed to communism, neighboring countries would subsequently follow, similar to a row of dominoes falling over. This belief drove the United States to become involved in various conflicts, most notably the Vietnam War, as policymakers feared that the spread of communism could destabilize entire regions. The Domino Theory emphasized a strategy of containment, where preventing one nation from falling to communism was seen as crucial to preserving the stability and influence of non-communist governments in the surrounding areas.