What was the invention that catapultad the slaves population in the south, and why?

It was the cotton gin, growing cotton became widely profitable and easier, more slaves were needed it tied the economy of the south to slaves and cotton.

The cotton gin. The slave population was decreasing but the cotton gin brought it up because now one man could process 50 pounds of cotton instead of 5 pounds a day. The Southern wanted more slaves to make more cotton because cotton was a very large profit for them. The cotton sold for high amounts. The reason it took a lot to process cotton was because the slaves had to removed each and every seed in the cotton by hand but the cotton gin made the fast a easy.