How did the Roosevelt Corollary change the Monroe Doctrine in 1904?

The Roosevelt Corollary, announced by President Theodore Roosevelt in 1904, significantly extended the Monroe Doctrine rather than merely interpreting it.12

While the original 1823 doctrine primarily aimed to prevent new European colonization or interference in the Western Hemisphere, the Roosevelt Corollary asserted that the United States had the right to exercise "international police power" in the region. Roosevelt argued that because the Monroe Doctrine forbade European powers from using force to collect debts or address grievances in Latin American states, the United States was obligated to intervene itself to ensure those states maintained order and met their financial responsibilities.312

By establishing this role, the United States sought to preclude European military intervention in the Caribbean and Latin America, effectively transforming the doctrine into a justification for U.S. intervention in the internal affairs of sovereign nations to protect American interests and regional stability.312