Turkey's current boundaries were drawn in 1923 at the Conference of Lausanne, and Turkey became a republic with Kemal Atatürk as the first president. The Ottoman sultanate and caliphate were abolished, and modernization, reform, and industrialization began under Atatürk's direction. He secularized Turkish society, reducing Islam's dominant role and replacing Arabic with the Latin alphabet for writing the Turkish language. After Atatürk's death in 1938, parliamentary government and a multiparty system gradually took root in Turkey, despite periods of instability and brief intervals of military rule. Neutral during most of World War II, Turkey, on Feb. 23, 1945, declared war on Germany and Japan, but it took no active part in the conflict. Turkey became a full member of NATO in 1952, was a signatory in the Balkan Entente (1953), joined the Baghdad Pact (1955; later CENTO), joined the Organization for European Economic Cooperation (OEEC) and the Council of Europe, and became an associate member of the European Common Market in 1963.
Turkey invaded Cyprus by sea and air on July 20, 1974, following the failure of diplomatic efforts to resolve conflicts between Turkish and Greek Cypriots. Turkey unilaterally announced a cease-fire on Aug. 16, after having gained control of 40% of the island. Turkish Cypriots established their own state in the north on Feb. 13, 1975. In July 1975, after a 30-day warning, Turkey took control of all the U.S. installations except the joint defense base at Incirlik, which it reserved for “NATO tasks alone.”
The establishment of military government in Sept. 1980 stopped the slide toward anarchy and brought some improvement in the economy. A constituent assembly, consisting of the six-member national security council and members appointed by them, drafted a new constitution that was approved by an overwhelming (91.5%) majority of the voters in a Nov. 6, 1982, referendum. Martial law was gradually lifted. The military, however, effectively continues to control the country.