The introduction of the cotton gin meant that enslaved workers on southern plantations no longer had to

d

Explanation:

the cotton gin had metal wire and pick in it so cotton seed would get caught and seperated

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.

its a map of something