How did mansa musa affect the mali empire?

When Mansa Musa, the emperor of Mali in the 14th century, returned from Hajj, or the pilgrimage to Mecca, he was accompanied by Arab scholars, bureaucrats and architects, whose collective influence on Mali was markedly positive. The architect Ishaq El Teudjin, in particular, introduced a number of advanced building techniques.

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“what were the main causes for the decline of the roman empire? ”