From 1775 to 1830, many african americans gained freedom from slavery, yet during the same period the institution of slavery expanded. explain why both of those changes took place. analyze the ways that both free african americans and enslaved african americans responded to the challenges confronting them.

the answer for 3 is b and the answer for 4 is d

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.