Why did Roosevelt issue his corollary to the Monroe Doctrine? ?

The Roosevelt Corollary was a substantial amendment to the Monroe Doctrine by U.S. President Theodore Roosevelt in 1904. Roosevelt's extension of the Monroe Doctrine erted the right of the United States to intervene to stabilize the economic affairs of small nations in the Caribbean and Central America if they were unable to pay their international debts. The alternative was intervention by European powers, especially Britain and Germany, which loaned money to the countries that did not repay. The catalyst of the new policy was Germany's aggressiveness in the Venezuela affair of 1902-03.(Marks 1979).