The Roosevelt Corollary was an addition to the Monroe Doctrine. It stated that no European countries were allowed to intervene in Latin American affairs. The only way that the U.S was allowed to become involved was if theaffairs or European countries was threatened. The United States could exercise police power in Latin America. The United States was the only country allowed to interfere with Latin American countries.
In late 1902, Britain, Germany, and Italy implemented a naval blockade of several months against Venezuela because of President Cipriano Castros refusal to pay foreign debts and damages suffered byEuropean citizens in a recent Venezuelan civil war. The incident was called the Venezuela Crisis of 1902–1903.
In 1934, Franklin D. Roosevelt furtherrenounced interventionism and established his "Good Neighbor Policy", leaving unchallenged the emergence of dictatorships like that of Batista in Cuba or Trujillo in the Dominican Republic. Three highly oppressive dictators- Dominican Republic dictator Rafael Trujillo, Nicaraguan dictator Anastasio Somoza, and Haitian dictator François Duvalier- were each considered to be "frankenstein dictators" due to the mishandlings of the American occupations in the countries.
The Roosevelt Corollary was supposed to be an addition to the Monroe Doctrine, however, it could be seen as a departure. While the Monroe Doctrine said European countriesshould stay out of Latin America, the Roosevelt Corollary took this further to say that theUnited States had the right to exercise military force in Latin American countries in order to keep European countries out References: "The Roosevelt Corollary“ by Richard Serge Theodore Roosevelt, Corollary to The Monroe Doctrine, 1904 President Theodore Roosevelt Thanks to: http://www.youtube.com/watch?v=pkJCeMf9ERo