Massive amounts of dust poured off of West Africa throughout the month of July 2016, with strong winds lofting dust and sand high into the atmosphere and across the Atlantic Ocean.

The development of the region’s economy allowed more centralized states and civilizations to form, beginning with Dhar Tichitt that began in 1600 B.C. followed by Djenné-Djenno beginning in 300 B.C. This was then succeeded by the Ghana Empire that first flourished between the 9th and 12th centuries, which later gave way to the Mali Empire. In current-day Mauritania, there exist archaeological sites in the towns of Tichit and Oualata that were initially constructed around 2000 B.C., and were found to have originated from the Soninke branch of the Mandé peoples. Also, based on the archaeology of the city of Kumbi Saleh in modern-day Mauritania, the Mali empire came to dominate much of the region until its defeat by Almoravid invaders in 1052. NASA’S view.
Three great kingdoms were identified in Bilad al-Sudan by the ninth century. They included Ghana, Gao and Kanem.
The Sosso Empire sought to fill the void but was defeated (c. 1240) by the Mandinka forces of Sundiata Keita, founder of the new Mali Empire. The Mali Empire continued to flourish for several centuries, most particularly under Sundiata’s grandnephew Musa I, before a succession of weak rulers led to its collapse under Mossi, Tuareg and Songhai invaders. In the 15th century, the Songhai would form a new dominant state based on Gao, in the Songhai Empire, under the leadership of Sonni Ali and Askia Mohammed.