Early African societies were often stateless, with kinship and religion playing central roles. West Africa saw the development of ironworking, agriculture, and Bantu migrations. Some early states included Kush/Nubia, Ghana, and various Christian kingdoms. The arrival of Islam in North Africa in the 7th century spread south, influencing states like Mali, Songhai, and Swahili city-states along trade routes. Urban centers developed in West and Southeast Africa focused on trade of gold, salt, and other goods.