Islam had codified and institutionalised the abhorrent practice long before the transatlantic slave trade. The taking of non-Muslim slaves is sanctioned by the Quran and the practice is further supported in the ahadith, the sayings and traditions of Mohammed (himself a slave-taker and owner); with swathes of text dealing with the jurisprudence, treatment and commercial rules surrounding slavery.
And now it is back with a vengeance with the slide of many Muslim-majority countries into near or actual failed states, legitimate government gives way to Sharia law and slavery (although it never really ended, merely declining in scale and retreating into the shadows); is becoming common practice once again.
More Cultural Enrichmnent from the Religion of Peace.