 Complete the following phrase:  During the Ottoman Empire 15161922, large Kurdish-speaking tribal groups both settled in and were deported to areas of northern Syria from Anatolia. By the 18th century, five Kurdish tribes existed in northeastern Syria. The demographics of this area underwent a huge shift in the early part of the 20th century. Some Circassian, Kurdish and Chechen tribes cooperated with the Ottoman Turkish authorities in the massacres of 