Geography: Ghana was located in what is now southeastern Mauritania and eastern Mali, while Songhai was located in present-day western Niger and eastern Mali. Ghana was a landlocked empire, while Songhai had access to the Niger River, which allowed it to trade with other regions of Africa and the Middle East.
Economy: Ghana's economy was based primarily on trade, with the empire serving as a major hub for the trans-Saharan trade route. Ghana exported gold, ivory, and slaves, and imported salt, cloth, and other goods. Songhai also depended on trade, but its economy was also based on agriculture. The Songhai Empire produced millet, sorghum, rice, and cotton.
Government: Ghana was ruled by a king who was elected by a council of elders. The king was assisted by a number of officials, including the chancellor, the treasurer, and the commander of the army. Songhai was ruled by a single emperor who held absolute power. The emperor was assisted by a vizier, who was responsible for the day-to-day administration of the empire.
Religion: Ghana was originally animist, but later converted to Islam. Songhai was also originally animist, but it converted to Islam in the 11th century. Both empires were tolerant of other religions, and there were large populations of Christians and Jews living in both Ghana and Songhai.
Decline: Ghana began to decline in the 13th century due to a number of factors, including the rise of the Mali Empire and the loss of control of the trans-Saharan trade route. Songhai began to decline in the 16th century due to the rise of the Moroccan Saadi dynasty and internal political instability.