The Monroe Doctrine (1823) declared that the U.S. would consider any further European colonization efforts in Latin America to be acts of aggression against the United States. It did not, however, propose to interfere with any existing European colonies, or to meddle in internal affairs in Europe. In addition to protecting Latin America, it signaled that the United States had emerged as a world power.
The Roosevelt Corollary (1904) was a declaration by President Theodore Roosevelt that the United States would mediate conflicts between the European powers and the countries of Latin America, rather than leave it to the Europeans to settle these issues directly. Roosevelt justified this declaration by describing the United States as having the responsibility of "international police power" to settle disputes occurring in the Western Hemisphere, stating that the United States had a right to use military force in Latin America to keep the European powers from doing so.
I hope this is helpful.
Content will be erased after question is completed.