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The movement of the United States from an isolationist foreign policy to one of intervention was a major ideological change for a country mostly used to looking inward. This change was most distinct during and immediately after WWII, and had worldwide implications. It will be argued that the policy was a clear progression, and was due to several linked factors.
<span>These were the primacy of U.S. interests, the strong leadership of Franklin D. Roosevelt (who was clearly not isolationist), the changing public mood, the increasing influence of the military, and the perceived threat of Communism, particularly from the Soviets."
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http://klarbooks.com/academic/isolate.html