What was the most direct result of the policy stated in the excerpt regarding European intervention?

The most direct result of the policy regarding European intervention is that the United States intervened in many American countries in the early 20th century. This reflects a fundamental aspect of U.S. foreign policy during that period, particularly influenced by the Monroe Doctrine and later the Roosevelt Corollary, which asserted that the United States would act as a protector of the Western Hemisphere.

The Monroe Doctrine initially established that European powers should not interfere in the affairs of the nations of the Americas, essentially warning them to stay out of the Western Hemisphere. The Roosevelt Corollary expanded on this, stating that the United States had the right to intervene in Latin American countries to maintain stability and order, thus preventing European intervention. This doctrine led to several U.S. interventions in countries like Panama, Haiti, and the Dominican Republic during the early 20th century, justifying American influence in the region while discouraging European powers from asserting their interests.

In this historical context, the choice that identifies U.S. intervention in American countries aligns perfectly with the outcomes of these policies, demonstrating the U.S. commitment to maintaining its influence and preventing European dominance in the Americas.