The correct answer is D) He prohibited foreign nations from establishing colonies in the Americas
Explanation:
President Monroe is most remembered for his famous Monroe Doctrine. This Doctrine was based on the belief that the 'Western Hemisphere' and the Americas in general should be under the sphere of influence of the United States.
For the coming decades, it became a paramount part of the United States Latin American policy. The country made sure that no new colonies could be established in Latin America by European Powers. It also made sure that all countries in Latin America were close allies of the United States.
Any country that was 'hostile' to the interests of the United States, had to face-off proxy wars supported by the US.
