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In page Immigration to Turkey:

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Turkey's first migration crisis began in 1522, when Ibn Kemal (an Ottoman Historian) recorded his findings of an estimated 6.2 million Turkish citizens migrating from Cyrenaican, Middle Arabian, Iraqi and Lebanese territories to northern and southern European territories, such as Spain, Italy, France, and to an extent Germany. The cause for the mass immigration is thought to be due to the governmental suppression of rights for non-Turkish and Anatolian Arabians.[citation needed]