The foreign policy that added to the Monroe Doctrine during the early part of the twentieth century was called the?

The foreign policy that added to the Monroe Doctrine during the early part of the twentieth century was called the Roosevelt Corollary. Announced by President Theodore Roosevelt in 1904, it asserted the United States' right to intervene in Latin American countries to maintain stability and order. This corollary effectively expanded the Monroe Doctrine by justifying American intervention in the Western Hemisphere under the guise of preventing European intervention.