The Roosevelt Corollary was a policy encouraged by United States PresidentTheodore Roosevelt when he asked the United States to become more active in a crisis in Venezuela. Roosevelt addressed Congress in 1904 and 1905 to encourage the policy.
Essentially, the Roosevelt Corollary was an extension of the Monroe Doctrine. The Monroe Doctrine requested the European countries not become more involved in countries in the Western Hemisphere. However, it was mostly passive; the Roosevelt Corollary was active. Roosevelt wanted the U.S. to intercede on the behalf of Venezuela to its European creditors, as he feared the debt could lead to war. He believed and stated that the U.S. should act as a police in the region if and when necessary.