Who supplied most of the labor on cotton plantation?

The textile mills of New England and Great Britain demanded cotton, and the American South supplied it. By 1820, the United States was more than growing 30 times as much cotton as it had when Whitney invented the gin, making it the world's leading supplier.

slaves

Explanation:

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.

rosevelt. 1973. "slaves everywhere"