2. Why did enslavement grow so rapidly from 1800 to 1860? 3. What caused the rise of abolitionists in the North?

2. One of the primary reasons for the reinvigoration of slavery was the invention and rapid widespread adoption of the cotton gin. This machine allowed Southern planters to grow a variety of cotton - short staple cotton - that was especially well suited to the climate of the Deep South.

3. The Missouri Compromise of 1820, which allowed Missouri to become a slave state, further provoked anti-slave sentiment in the North. The abolitionist movement began as a more organized, radical and immediate effort to end slavery than earlier campaigns. It officially emerged around 1830.