The expansion of U.S. influence in the Western Hemisphere was largely justified by which doctrine?

The Roosevelt Corollary to the Monroe Doctrine was a significant justification for the expansion of U.S. influence in the Western Hemisphere during the early 20th century. It articulated the United States' right to intervene in the affairs of Latin American countries to maintain stability and order, especially when European powers were perceived to be threatening the sovereignty of these nations. This doctrine was invoked to assert that the United States would act as an "international police power" to manage disputes and prevent foreign intervention, thereby reinforcing America’s role as a dominant force in the region.

While the Monroe Doctrine initially established the framework for U.S. non-colonization and non-interference in the Americas in 1823, the Roosevelt Corollary expanded upon that by giving a rationale for interventionism. This reflected a shift in foreign policy from passive containment of European influences to active intervention in the domestic affairs of neighboring countries. Such actions were justified under the guise of promoting political stability and economic development in the region.

The other options, like the New Deal, primarily focused on domestic economic recovery from the Great Depression, while Dollar Diplomacy was more about promoting U.S. financial interests abroad rather than asserting direct control or influence in the Western Hemisphere. Therefore, the Roosevelt Corollary represents