Final answer:
President Eisenhower demonstrated the Domino Theory by highlighting the potential for the spread of communism from one country to others in a chain reaction.
Explanation:
President Eisenhower illustrated the Domino Theory through his belief that the spread of communism in one country could lead to neighboring countries falling into communism, like dominoes. For example, he thought that if Vietnam fell to communism, it could lead to other Southeast Asian countries following suit. This concept influenced US policy during the Cold War, leading to increased involvement in the region to prevent the spread of communism.
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