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After the failure of the policies of appeasement towards Nazi Germany in the run up to WWII no political figure in the United States wanted to be labeled an appeaser. This led to a vast shift in the focus of US foreign and domestic policies.
In order to confront and contain communism (motivated by the domino theory which stated that once one country "fell" to communism others would follow) the US became a major player in the rebuilding of Europe (the Marshal Plan) and stopping the spread of communism in the eastern mediterranian (military aid to Greece). The US went on to become involved in supporting military dictatorships across Latin American and Africa and eventually the proxy wars in Vietnam and Afghanistan.
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