How did labor specialization led to a diverse economy in west africa?

In Africa, a number of specialized occupations developed ,highly skilled metal smiths developed more efficient tool that increase agricultural productivity. they also produce improved weapons ,which  became important in the expansion of kingdoms.

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Bhaktapur "Cancer Hospital - inaugurated among a big mass by Minister of Health-buin from the financial support of the government of japan-work started in 1999-ended in 2005-has the capacity of 100 beds-people look cheerful and hopeful about the future best wishes from the minister.