John Quincy Adams
Proposed a constitutional amendment to abolish slavery.
A secret network that helped slaves escape to freedom.
He led the Pottawatomie Massacre in 1856 in Bleeding Kansas and made his name in the unsuccessful raid at Harpers Ferry in 1859.
Established the Ohio River as the boundary between free and slave territory in the region between the Appalachian Mountains and the Mississippi River.
Most important leader of the Underground Railroad.