What does he imply here about getting ahead in America in his day? Specifically, who does he
suggest is able to rise above the "lower levels"?

interdependence is when all participating groups and individuals depend on each other. if you depend on one anothers goods, you end up trading in order to get the items you're looking for. (for ex: if i have food and you have water, we trade in order to depend on each other to live)

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

this is a good question! i'll do some research and come back when i have the answer!

answer; (c) slaves brought to the americans from africa;