Missouri Compromise Map: Free vs. Slave States and Territories in 1820 #2241977 (License: Personal Use)

This 19th-century political map depicts the United States after the Missouri Compromise of 1820, highlighting how new states and territories were classified as free or slave based on latitude. The compromise admitted Missouri as a slave state and Maine as a free state, while prohibiting slavery north of the 36°30′ parallel in the Louisiana Purchase lands. Key regions like the Unorganized Territory, Oregon Country, and New Spain are also labeled to provide geopolitical context.

Used in educational history web pages, museum exhibits, and academic articles about antebellum U.S. politics; serves users researching the causes of the Civil War, congressional compromises, or territorial expansion.