Respuesta :

slavery was dying out in the south until the cotton gin was invented. Suddenly there was allot of money to be made from cotton but people were needed to pick the cotton and then separate the fibers on the cotton gin so it grow in popularity again.

Answer:

Because they were needed.

Explanation:

Slaves were needed for agricultural reasons. They were cheap and dispensable. Although it was despicable White land owners refused to give up their slaves which literally started a civil war. But slavery died with the emancipation proclamation.