What extension of the Monroe Doctrine was proclaimed in 1904?

The Roosevelt Corollary is the correct answer because it served as an extension of the Monroe Doctrine, which was originally proclaimed in 1823 by President James Monroe. The Monroe Doctrine asserted that European powers should no longer colonize or interfere in the affairs of the Americas. In 1904, President Theodore Roosevelt expanded upon this doctrine with the Roosevelt Corollary, which stated that the United States would intervene in Latin American nations to maintain stability and orderly governance, especially if those nations were unable to pay their international debts. This was aimed at preventing European intervention in the region, effectively positioning the United States as a regional police power and reinforcing American influence in the Western Hemisphere.

The other options represent different U.S. foreign policy principles introduced in unrelated historical contexts: the Truman Doctrine focused on containing communism after World War II, the Eisenhower Doctrine responded to needs in the Middle East, and the Wilsonian Principle emphasized self-determination and democracy in the aftermath of World War I. Each of these doctrines has its own specific context and implications, distinct from the Monroe Doctrine and its Roosevelt Corollary.