Lies Taught in Colleges

From the book I am currently studying:
"The international slave trade in Africans began with the Arab conquests in northern and eastern Africa and the Mediterranean coast in the seventh century. From the seventh to the eleventh century, Arabs and Africans brought large numbers of European slaves into the North African ports of Tangier Algiers, Tunis, Tripoli and Fez. In fact, most of the slaves traded throughout the Mediterranean before the fall of Constantinople were European."
This, from the most liberal of all textbooks I have ever seen... from a Social Science class too. Hmmm...