Explain the Domino Theory as a reason for U. S. involvement in Vietnam.

The Domino Theory was the reason the US involved in both the Korean & Vietnam War. What the Theory suggested was that, if communism spread through both of those countries, the neighboring countries within the spheres of influence would most likely also fall under the rule of Communism. The US then tried to use the policy of containment to defeat the Domino Theory, which worked in most cases except for Vietnam.

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