The Monroe Doctrine set the stage for U.S. imperialism because a.it asserted the United States' interest in expanding across North America (south of Canada) and influencing the affairs of the Western Hemisphere.
The Monroe doctrine made it clear to European countries that they were not to intervene in the affairs of Latin American countries.
Latin American countries were from thence considered a U.S. sphere of influence which laid the foundation for the U.S. gaining more territories as spheres of influence.
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