of maturity characterized by long-distance trade and complex, many-tiered political systems. In Egypt and North Africa it was a period of religious and cultural consolidation when the Arabic language and the faith of Islam were adopted by the majority of the indigenous Copts and Berbers. In the sub-Saharan Savanna it was a period rather of penetration when Muslim merchants and clerics built up small but significant minorities of Negro African converts. Muslim migrants conquered the Nilotic Sudan, encircled Christian Ethiopia and settled the coastline of eastern Africa. But throughout the period African states, large and small, were strong enough, relatively, to control their visitors from the outside world. The main significance of the outsiders, whether Muslim or Christian, was as literate observers of the African scene.

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