The Missouri Compromise Map (1820-1821) | U.S. History Visual Guide #2241984 (License: Personal Use)

The map depicts the United States in 1820-1821, highlighting the geographic impact of the Missouri Compromise: states and territories are color-coded to show those closed to slavery (teal), open to slavery (tan), free states/territories (light green), and slave states/territories (pink). Key features include the 36°30′ Missouri Compromise Line, the Arkansas Territory, and the Adams-Onís Treaty Line of 1819 demarcating Spanish possessions. Washington, D.C., and major eastern states are labeled, emphasizing the political geography of sectional tension.

Used in educational contexts-U.S. history classrooms, digital textbooks, museum exhibits, and online encyclopedias-to explain antebellum sectionalism and the legislative efforts to maintain balance between free and slave states. Matches user intent for learning about pre-Civil War compromises and territorial governance.