Answer:
It was destroyed by the Almoravids, who took control in the country for the next ten years.
Explanation:
The sacking of Ghana by Almoravids in something that can be seen even as a holy war led to the decline of its power and its trade links. Although their rule lasted for only a couple of years, they weren't able to recover and to extent their trade once more as they did before this event.
The economy of the North was based mainly on Manufacturing. Many immigrants from Europe began working in factories and producing goods (cloth) in the North and Northeners believed that slavery should farther then where it already was
While The economy of the South was based on agriculture and they firmly believe that Slavery should spread due to the big profit of cotton that was picked by slaves
Weapons manufacturers had maneuvered the government to declare war so they can make profits.
I hope that's the answer you were looking for