Final answer:
The United States promised to prevent European colonization in the Americas and warned against interference in the affairs of independent countries in the Monroe Doctrine.
Step-by-step explanation:
The United States promised several things in the Monroe Doctrine. First, it stated that the Americas were off-limits for future colonization by European powers. Second, it warned European nations to not interfere in the affairs of independent countries in the Americas. Third, it declared that any attempt by European powers to establish new colonies or extend their influence in the Americas would be seen as a threat to the United States and would be met with resistance.
Learn more about The United States promises in the Monroe Doctrine