Roosevelt's corollary justified America's expansion into the Western Hemisphere.
President Roosevelt revived the Monroe Doctrine and added his own corollary after becoming convinced that all of Latin America was open to European aggression. The Roosevelt Corollary went a step farther than the Monroe Doctrine in preventing further European expansion in the Western Hemisphere. The United States military would intervene if any Latin American country engaged in "chronic wrongdoing," which was defined as having significant debts or experiencing public upheaval. The Western Hemisphere would be policed by America, with Europe staying across the Atlantic.
In 1905, the Dominican Republic was threatened with invasion by European debt collectors, which provided the first opportunity to put this new policy into action. The island nation was invaded, its customs offices were taken, and the Dominican Republic was administered by the US as a protectorate until things stabilised.
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