Post-World War II, many western political leaders who greatly feared the spread of communist ideologies contended that the fall of a nation to communism would lead to the fall of neighboring nations in a manner similar to dominoes falling in a line of succession. First theorized in the 1940s by President Harry S. Truman as the Cold War began to unfold and tension between the United States and the Soviet Union began to rise, the Domino Theory is now seen as a great instance of fear mongering that lead to what some believe to have been unnecessary wars, including Korea or Vietnam.
How then can this supposedly irrational theory propelled by fear help the world to understand the ways in which 21st century global threats grow? How will this help leaders to find ways to combat it?
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