Missouri Compromise Map 1820 - Free vs. Slave States & Territories #2241972 (License: Personal Use)

The map details U.S. political geography circa 1820, with red indicating established slave states (e.g., Virginia, Georgia), green for free states and territories (e.g., Ohio, Michigan Territory), yellow for the Arkansas Territory open to slavery under the compromise, and blue for areas closed to slavery north of the 36°30′ parallel. Key treaties-Missouri Compromise (1820) and Adams-Onís (1819)-are annotated, along with territorial claims like Spanish Florida ceded in 1819 and the contested Oregon Country.

Used in educational history resources, AP U.S. History curricula, and digital archives to explain antebellum sectionalism, congressional compromises, and westward expansion; targets students, teachers, and researchers seeking visual context for pre-Civil War tensions.