 The sale of European slaves by Europeans slowly ended as the Slavic and Baltic ethnic groups Christianized by the Late Middle Ages.European slaves did not pass on an inherited status and was thus more akin to forced labor, or indentured servitude.From the 1440s into the 18th century, Europeans from Italy, Spain, Portugal, France, and England were sold into slavery by North Africans, as described in the book "Christian Slaves, Muslim Masters".