5. What effect did the invention of the cotton gin have on slavery? a. by decreasing the amount of slaves in the South, especially Alabama
b. by restricting slavery only in the North but not in the South
c. by increasing the demand for more slaves to plant and harvest more cotton
d. by ending slavery in the Deep South

c. by increasing the demand for more slaves to plant and harvest more cotton

Explanation:

While the cotton gin helped in reducing the amount of work needed in removing seeds, it actually increased the need for slaves to plant and harvest the cotton and the need for land.

i would say that the politicial parties from state to state varies.

not really sure i needed the points. sorry