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 second significant cause of the great migration was the desire of black southerners to escape segregation, known euphemistically as jim crow. rural african american southerners believed that segregation - and racism and prejudice against blacks - was significantly less intense in the north.

tenochtitlan (also spelled tenochtitlán), located on an island near the western shore of lake texcoco in central mexico, was the capital city and religious centre of the aztec civilization. the traditional founding date of the city was 1345 ce and it remained the most important aztec centre until its destruction at the hands of the conquering spanish led by hernán cortés in 1521 ce, which led to the final collapse of the aztec empire.