As a result of our mistakes in Vietnam, the US's foreign policy has shifted toward one containment policy.
The United States pursued a containment-based foreign strategy during the Cold War. The theory held that communism needed to be contained and isolated in order to stop it from spreading to other countries, and it was initially introduced by George F. Kennan in 1947. American foreign policy advisors believed that, like a line of dominoes, the entire area would adopt communism as soon as one country did. This kind of thinking was known as the domino theory. Following the containment strategy and domino theory ultimately resulted in American action in Grenada, Central America, and Vietnam. After World War Two, when countries formerly under Nazi domination were divided between the U.S.S.R.'s conquests and the newly liberated states of France, Poland, and the remainder of Nazi-occupied Europe, the Cold War was born.
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