" Rather than ally directly with Britain in the matter, however, President Monroe instead made a unilateral declaration: while currently existing European colonies would not be molested by the U.S., under no circumstances would new ones be permitted; nor would reconquest of the new Latin nations. While at the time only possible because the British were resolved on the same course, this “Monroe Doctrine” basically declared to the world that the Americas were henceforth open only to United States exploitation. This would have a tremendous influence on the subsequent internal history of Latin America. As in Mexico so in the rest of the region—the Liberals looked to the U.S. for support, while the Conservatives gazed towards a Europe rendered powerless to help them (unless the Europeans didn’t mind a war with the ever-stronger United States). "

― , Puritan's Empire