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History of slavery in the Muslim world - Wikipedia
Bernard Lewis writes: "In one of the sad paradoxes of human history, it was the humanitarian reforms brought by Islam that resulted in a vast development of the
slave trade inside, and still more outside, the Islamic empire." He notes that the Islamic injunctions against the enslavement of Muslims led to massive importation of slaves from the outside.
[33] According to Patrick Manning, Islam by recognizing and codifying the slavery seems to have done more to protect and expand slavery than the reverse.
[26]
The 'Arab' slave trade is sometimes called the 'Islamic' slave trade. Bernard Lewis writes that "polytheists and idolaters were seen primarily as sources of slaves, to be imported into the Islamic world and molded in Islamic ways, and, since they possessed no religion of their own worth the mention, as natural recruits for Islam."
[34] Patrick Manning states that religion was hardly the point of this slavery.
[35] Also, this term suggests comparison between Islamic slave trade and
Christian slave trade. Propagators of Islam in Africa often revealed a cautious attitude towards proselytizing because of its effect in reducing the potential reservoir of slaves.
[36]
Arab or Islamic slave trade lasted much longer than Atlantic or European slave trade: "It began in the middle of the seventh century and survives today in Mauritania and Sudan. With the Islamic slave trade, we're talking of 14 centuries rather than four." Further, "whereas the gender ratio of slaves in the Atlantic trade was two males to every female, in the Islamic trade, it was two females to every male," according to Ronald Segal
[37]
You don't know Islamic history, as your bias for Islam makes you blind to much of it.