Answer:
It warned European nations not to colonize Latin America because the U.S. would intercede.
Step-by-step explanation:
The Monroe Doctrine introduced during the presidency of James Monroe. The Monroe Doctrine was a foreign policy issued in 1823 that threatens European nations not to allow more colonization and monarchs rule in the Western Hemisphere. It was also relevant that the United States would intervene in the situation. The doctrine helped North and South America to adopt democratic government.