Which concept suggests that political revolutions in one country can lead to similar events in neighboring countries?

The correct answer is the Domino Theory. This concept posits that political events, particularly revolutions or changes in government, can have a ripple effect, causing similar movements in neighboring countries. The idea emerged prominently during the Cold War, particularly in the context of the spread of communism. Advocates of this theory suggested that if one nation fell to communism or experienced a significant change, neighboring nations might soon follow suit, akin to a line of dominoes falling.

The Domino Theory shaped U.S. foreign policy, especially in regions like Southeast Asia, where the concern was that a single country succumbing to communism would have a cascading effect across the region, threatening U.S. interests and allies. This led to active interventions and support for anti-communist efforts in various countries.

While other concepts mentioned, such as Revolutionary Cascade and Contagion Hypothesis, may describe similar phenomena, they are not as widely recognized or directly associated with the Cold War context as the Domino Theory. Chain Reaction Theory also conveys a related idea, but it does not specifically focus on the political context in the same manner.