What was the purpose of the 36°30 line set by the Missouri Compromise?

• A. It freed all enslaved people in new territories.
• B. It set the free/slave boundary for future territories.
• C. It created the border between Canada and the United States.
• D. It established a nationwide ban on slavery.

Answer: (B)

Geographic boundaries were used to manage sectional tensions by deciding where slavery would be legal as new territories formed. The 36°30′ line across the Louisiana Purchase acted as a dividing line: land north of that latitude would be free of slavery, with a Missouri exception, and land south of it could allow slavery. This arrangement was meant to keep a balance in Congress between free and slave states as new territories were admitted. It wasn’t about immediately freeing people everywhere, nor about a border with Canada, nor a nationwide ban on slavery. Instead, it established a legal boundary that future territories would follow when determining their status on slavery.