Minorities in Turkey seekers. By the end 2011, their numbers are expected to surge up to 10,000, making them the largest population and surpass other groups. Ethnic Kurds are the largest minority in Turkey, composing around 20% of the population according to Milliyet, 18% of the total populace or c. 14 million people according to the CIA World Factbook, and as much as 23% according to Kurdologist David McDowall. Unlike the Turks, the Kurds speak an Iranian language. There are Kurds living all over Turkey, but most live to the east and southeast of the country, from where they originate. In the 1930s,
Population exchange between Greece and Turkey a legitimizing factor or a "safe criterion" in marking ethnic groups as Turkish or as Greek in the population exchange. As a result, the Greek-Turkish population exchange did exchange the Greek-Orthodox population of Anatolia, Turkey and the Muslim population of Greece. However, due to the heterogeneous nature of these former Ottoman lands, many other ethnic groups posed social and legal challenges to the terms of the agreement for years after its signing. Among these were the Protestant and Catholic Greeks, the Arabs, Albanians, Russians, Serbians, Romanians of the Greek Orthodox religion; the Albanian, Bulgarian, Greek Muslims of Macedonia and Epirus,