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In page History of Africa:

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In the 15th century, the Portuguese, following the development of the caravel, set up trading posts along the Atlantic coast, with Mali establishing formal commercial relations, and the Spanish soon following. In the early 15th century Diarra escaped Malian rule.[7]: 130  Previously under Malian suzerainty and under pressure from the expansionist Jolof Empire, a Fula chief migrated to Futa Toro, founding Futa Kingui in the lands of Diarra circa 1450.[citation needed] Yatenga capitalised on Mali's decline and conquered Macina, and the old province of Wagadu.[citation needed] Meanwhile Gao, ruled by the Sonni dynasty, expanded, conquering Mema from Mali,[citation needed] and launched a jihad against Yatenga,[5]: 81  in a struggle over the crumbling empire.