Why did slavery arise in the south in the late eighteenth century?
a. the federal government supported slavery
b. railroads began transporting goods from place to place.
c. tobacco continued to decline as demand dropped.
d. the cotton gin was invented.

D)

Explanation:

This led to the need for slavery to increase mass profit from farms and land

The answer is D)The cotton gin was invented

Explanation:

The cotton gin was invented by Eli Whitney at the end of the 18th century, in 1793. It constituted a huge change in the American cotton industry. However, it led to the increase of slavery because the owners were in need of workforce. During these times, the number of slaves rose from around 700,000 in 1790 to around 3.2 million in 1850 .

the american civil war was not caused   by slavery but by economic factors.