Answer: The right answer is the Monroe Doctrine.
Explanation: The Monroe Doctrine was articulated by President James Monroe before Congress on December 2, 1823. It had been drawn up by Monroe and his Secretary of State, John Quincy Adams, and it opposed European interference in the newly independent Latin American countries (Mexico had become independent only two years earlier, in 1821), in part with the goal of strengthening the commercial ties with those same countries, and of increasing the influence of the United States over them - and over those lands that had not been colonized by the Europeans. This doctrine was later extended and altered by the so-called Roosevelt Corollary (December of 1904), which eventually granted the United States the unilateral power to intervene in politically unstable nations such as Cuba or Haiti.