Missouri Compromise of 1820 Map - U.S. Expansion and Slavery Boundary #2241976 (License: Personal Use)

This educational map visualizes the geographic impact of the Missouri Compromise, with blue indicating free states, dark teal for slave states, orange for territories closed to slavery (north of 36°30′ N), and gray for unorganized or Spanish-controlled lands. The red line marks the critical 36°30′ parallel, a key concession that admitted Missouri as a slave state and Maine as a free state while restricting slavery in the Louisiana Purchase lands north of that line. The map also labels key regions like Arkansas Territory, Michigan Territory, and Spanish Rule to contextualize U.S. borders at the time.

Used in history education websites, digital textbooks, museum exhibits, and AP U.S. History resources to explain antebellum political compromises; matches user intent for learning about slavery’s expansion, early U.S. territorial policy, and causes of the Civil War.