In 1823, Monroe announced the United States' opposition to any European intervention in the recently independent countries of the Americas with the Monroe Doctrine, which became a landmark in American foreign policy. Monroe was a member of the American Colonization Society, which supported the colonization of Africa by freed slaves, and Liberia's capital of Monrovia is named in his honor. He has been generally ranked as an above-average president by historians. As the United States continued to grow, many Americans advocated a system of internal improvements to help the country develop.
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