John Brown's failed attempt to loot the armory at Harper's Ferry sparks the beginning of abolition.

Slavery became an industry for the first time in history when millions of African men and women were sold as slaves to Europeans.

Born a slave, Harriett Tubman became a famous "conductor" on the Underground Railroad, leading hundreds of slaves to freedom.

America is at the brink of a Civil War as cotton spreads west and threatens to expand slavery into new territories.