Missouri Compromise Map: Free vs. Slave States and Territories in 1820 #2241986 (License: Personal Use)

This color-coded map depicts the geopolitical landscape of the United States following the Missouri Compromise of 1820, with the 36°30′N parallel serving as the critical boundary between future free and slave territories. Key regions labeled include the Oregon Country, Unorganized Territory, Republic of Texas, and areas disputed with Mexico, reflecting early 19th-century territorial expansion and sectional tensions. The red zone represents slave states and territories south of the compromise line, while green indicates free states and northern territories.

Used in educational history websites, textbooks, and museum exhibits to illustrate antebellum U.S. sectionalism and the legislative attempts to balance slave and free state representation; matches user intent for learning about pre-Civil War political geography.