Which factor contributed to the spread of the great depression overseas?

a. europe increased trade to the us.
b. congress lowered tariffs on foreign imports.
c. american idustry reduced production levels.
d. the us curtailed investments in europe.

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.