The songhay empire replaced the empire

The answer is the Mali Empire.

Explanation:

The Mali Empire was considered the most relevant state in West Africa. In the beginning, the Mali empire was a small kingdom that was established near the Niger River in 1000 CE. Because of King Sunni Ali's influence, the Mali empire experienced an expansion of its territory.

The Empire also prospered through the trans-Saharan trade and its development was during the 16th century CE. Mali Empire's trade was not only local but also international.

However, the empire had to face many difficulties during the 1460s CE. These difficulties were related to civil wars, the creation of trade routes by the competence, and the attacks from nomadic Tuareg as well as Mossi people. Then, the Songhay empire emerged and it had a lot of power at that time.  

answer; ///i believe that the correct answer is (a) the great depression

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