Wasn't slavery also stopped by Islamists in Central Asia in
the 1870s?  What are the best sources for this particular topic?

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I lent someone my copy of "Islam's Black Slaves" by Ronald Segal, but I 
believe all Islamic countries continued to practice slavery until pressured 
by the West to stop. It was part of their culture which became tied to their 
religion. Today, one-third the population of Mauretania are still slaves and 
a good percentage of the population of the Sudan.
Paul