History of South America

What was an affect of the Roosevelt Corollary to Monroe Doctrine?

Increased United States interventionism in the Western Hemisphere.

By asserting its right to intervene in the internal affairs of Latin American countries, the Roosevelt Corollary to the Monroe Doctrine gave the United States a rationale to justify interventions such as the Spanish-American War, the Panama Revolution, and the establishment of protectorates in Puerto Rico and the Dominican Republic.