Slavery had been practiced in many parts of the world for centuries. People tended to enslave their enemies, people they considered different enough from themselves to condemn to lifelong servitude. Sometimes, though not often, the status of slaves was heritable: the children of slaves were condemned to a life of slavery, too. Many wars had to do with religion, and because many slaves were prisoners of war, slaves and their owners tended to be people of different faiths: Christians enslaved Jews; Muslims enslaved Christians; Christians enslaved Muslims. Since the Middle Ages, Muslim traders
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