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Early modern periodFrom the seventh century , Arab trade with sub-Saharan Africa led to a gradual colonization of East Africa , around Zanzibar and other bases . Greenberg 's work , though initially greeted with scepticism , became the prevailing view for most scholars.Bennet and Sterk ( 1977 ) presented an internal reclassification based on lexicostatistics that laid the foundation for the regrouping in Bendor-Samuel 1989 . The reality of these images remains with us today in the form of film , architecture , literature , art and popular conception . Along with sub-Saharan Africa , the cultural arts of the western tribes , ancient Egyptian artifacts , and indigenous southern crafts also contributed greatly to African art . Managers and supervisors are encouraged to use this service whenever they need assistance with organisational or people management issues . While that goal is still far off , the era of the $ 100,000 genome is with us already .