What did the Monroe Doctrine warn European Nations not to do?
What did the US promise to do?
This site will help you with that.
http://en.wikipedia.org/wiki/Monroe_Doctrine
The Monroe Doctrine was a policy issued by President James Monroe in 1823, which warned European nations against future colonization in the Western Hemisphere. It stated that any attempts by European powers to colonize or interfere with countries in the Americas would be seen as acts of aggression towards the United States. The doctrine aimed to secure the United States' interests and maintain stability in the region.
To understand the specific details and promises made in the Monroe Doctrine, I recommend visiting the following website:
http://en.wikipedia.org/wiki/Monroe_Doctrine
This Wikipedia page provides a comprehensive explanation of the Monroe Doctrine, including its background, key points, and historical context. It will provide a detailed answer to your question and further information on this important historical document.