I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "Beginning several centuries ago, during the period of the Ottoman Empire, tens of thousands of Black Africans were brought by slave traders to plantations and agricultural areas situated between Antalya and Istanbul in present-day Turkey. Some of their descendants remained in situ, and many migrated to larger cities and towns. Other blacks slaves were transported to Crete, from where they or their descendants later reached the İzmir area through the population exchange between Greece and Turkey in 1923, or indirectly from Ayvalık in pursuit of work."? 

Whydid black turkish citizens move in the early 20th century?