Missouri Compromise Map 1820 - Free vs Slave States and Territories #2242013 (License: Personal Use)

The map depicts the United States shortly after the Missouri Compromise of 1820, highlighting Missouri’s admission as a slave state alongside Maine as a free state to preserve congressional balance. The 36°30′ parallel is clearly marked as the dividing line between future free and slave territories in the Louisiana Purchase lands, excluding Missouri itself. The unorganized western territory remains undivided above this line.

Used in educational resources, history websites, and digital archives to explain antebellum U.S. territorial policy and the roots of the Civil War; matches user intent for learning about 19th-century American political geography and slavery expansion.