Social Darwinism is the political theory that believes that competition and struggle improves the economic realm by allowing unrestrained and ruthless competition. Roosevelt was a Darwinist when it came to internal affairs. He firmly believed that there was constant competition between America and the other countries.
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While Roosevelt could indeed be classified as a social darwinist in international affairs, the father of social darwinism in American foreign policy was Millard Fillmore, one of the United States' most controversial leaders who championed a darwinist policy agenda.