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The Roosevelt Corollary to the Monroe Doctrine
extended American protection to Asian nations.
asserted the US right to intervene (militarily if necessary) in Latin American affairs in order to prevent European powers from having to invade those Latin American countries.
kicked off an era of isolationism that lasted until World War I.
was further enshrined in law with the passage of the Hay-Paunceforte Treaty.
actually revoked the Monroe Doctrine.