Answer:
Well, as much as I would like to be as accurate as possible in my response, I am unfamiliar with the unit you have studied, so I can't write about the unit's content. All I can do is write a generic sentence for you. Perhaps you can tweak it to suit your needs.
How about this:
Until it was destroyed by the Civil War, slavery made the American South the richest and most powerful region in America.
Explanation:
