Answer:
It was destroyed by the Almoravids, who took control in the country for the next ten years.
Step-by-step 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.