Answer:
Battles over succession.
Step-by-step explanation:
The Songhai Empire was one of the largest states in African history. It was located on the western Sahel and had its peak during the 15th and 16th centuries.
The Empire overpassed the Malian Empire and after that, a series of battles over the succession of power forced the empire into a period of decline and civil wars across the territory.
I hope this answer helps you.