The monroe doctrine was broadened during the early years of the twentieth century in an expansionist policy known as the roosevelt corollary open door policy dollar diplomacy taft doctrine

"Roosevelt Corollary"

Explanation:

The Monroe Doctrine is the principle of the foreign policy of the United States of not allowing the intervention of the European powers in the internal affairs of the countries of the American hemisphere. Derived from a message to Congress by President James Monroe on December 2, 1823. The Roosevelt corollary is a substantial alteration (called "amendment") to the Monroe Doctrine by the President of the United States of America Theodore Roosevelt. In its altered state, the Monroe Doctrine would now consider Latin America and the Caribbean as territory to expand the commercial interests of the United States in the region, in addition to its original purpose, to maintain European hegemony outside the hemisphere.

Ibelieve it would be homer plessy