sentences:  In Niger, where the practice of slavery was outlawed in 2003, according to the ABC News, almost 8% of the population are still enslaved.The Washington Post reported that many slaves held by the Tuareg in Mali were liberated during 2013-14 when French troops intervened on behalf of the Malian government against Islamic radicals allied to the Tuareg.The Tuareg social stratification involving noble, clerical and artisanal castes likely emerged after the 10th century, as a corollary of the rising slavery system.