Answer:
As slavery underwent a resurgence in southern Europe, it gradually disappeared from the northwestern part of the continent. Economic changes help to explain this development, but perhaps more important were cultural constraints. Over the course of the Middle Ages, Christians always committed awful atrocities on each other, but increasingly they avoided enslaving one another. Apparently, a sense of unity had emerged in Christian Europe that effectively barred the enslavement of those deemed fellow Europeans. Christianity's long struggle with Islam no doubt played a major role in this development. That from 1500 to 1800 Muslims enslaved well over a million Western Europeans, many of whom were subsequently ransomed and celebrated as symbols of freedom, was a major element in the growing sense that Europeans should never be slaves.
Explanation:
