What does the 9th amendment limit?

the enumeration in the constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.

Explanation:

people are not limited to just rights listed in the constitution

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.