What attracted immigrants and rural people to the cities?

One of those reasons was the availability of jobs. With the start of the industrial revolution, there were many jobs available in the cities. Some people came to the cities to escape the isolation of rural life. Hopefully that helps :)

Explanation:

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.