What political idea suggests that political unrest in one country can destabilize neighbors and start a chain of events?

Question

Quizplus · Accepted Answer

The domino theory suggests that political unrest in one country can cause neighboring countries to also become unstable and lead to a chain reaction of events. This was a major factor in the United States' involvement in the Vietnam War, as they feared that if South Vietnam fell to communism, other countries would follow suit.

What Political Idea Suggests That Political Unrest in One Country