Answer: Islam is the religion that spread from North Africa to West Africa through trans - Saharan trade routes.
Explanation:
The trans-Saharan commerce routes (the main trade was gold) aided the spread of Islam in North and West Africa. Muslim merchants and scholars traversed the desert in order to transact business and spread their faith. They introduced Islamic teachings and practices to local people as they interacted with them.
Conversion to Islam occurred gradually and was frequently accompanied by syncretism with pre-existing religious views. Establishing Muslim states such as the Almoravid and the Sokoto Caliphate strengthened Islam's presence there.
Finally, trans-Saharan commerce routes served as a conduit for the spread of Islam throughout North and West Africa.