Missouri Compromise 1820 map illustrating the division between free and slave states and the designated compromise line.

- Draw a horizontal line across the map at the 36°30′ parallel (the Missouri Compromise line).
- Label states north of the line as "Free States" (e.g., Maine, New York, Ohio, Indiana, Illinois, Michigan).
- Label states south of the line as "Slave States" (e.g., Virginia, North Carolina, South Carolina, Georgia, Alabama, Mississippi, Louisiana).
- Label the unorganized territory west of the Mississippi River and north of the line as "Free Territory".
- Label the unorganized territory west of the Mississippi River and south of the line as "Slave Territory".
- Label the large area west of the Louisiana Purchase (including present-day Texas, New Mexico, Arizona, etc.) as "Non-American Territory" (since it was not yet part of the U.S. in 1820).
- Complete the chart:
- Free States: Maine, New York, Ohio, Indiana, Illinois, Michigan
- Slave States: Virginia, North Carolina, South Carolina, Georgia, Alabama, Mississippi, Louisiana
- Free Territory: Louisiana Purchase land north of 36°30′
- Slave Territory: Louisiana Purchase land south of 36°30′
- Non-American Territory: Spanish-held lands (Texas, New Mexico, Arizona, etc.)
- Missouri Compromise Line: 36°30′ parallel