Answer:
If you are asking to define what these were, then the answers are:
Monroe Doctrine: Was a policy put out by President James Monroe in 1823, specifying that the U.S. would oppose European colonization.
The Roosevelt Corollary: An addition to the Monroe Doctrine by President Theodore Roosevelt, that European powers stay out of the Western Hemisphere, and that the U.S. had the right to intervene in the affairs of Latin American countries to maintain stability.