As president from 1817 to 1825, he presided over the so-called “Era of Good Feelings,” a period of surface national unity that masked deepening sectional tensions. His administration acquired Florida, navigated the first major economic panic, forged the Missouri Compromise, and issued the Monroe Doctrine—the foreign-policy statement that declared the Western Hemisphere off-limits to further European colonization. Written by Ashleigh Robertson, this concise yet comprehensive biography situates Monroe’s steady competence against the larger arc of American expansion, the politics of slavery, and the transition from the founding era to the age of Jacksonian democracy.