The leaders of the new republic concentrated on consolidating their power and modernizing and Westernizing what had been the empire's core--Asian Anatolia and a part of European Thrace. Social, political, linguistic, and economic reforms and attitudes decreed by Ataturk from 1924-1934 continue to be referred to as the ideological base of modern Turkey. In the post-Ataturk era, and especially after the military coup of 1960, this ideology came to be known as "Kemalism" and his reforms began to be referred to as "revolutions." Kemalism comprises a Turkish form of secularism, strong nationalism, statism, and to a degree a western orientation. The continued validity and applicability of Kemalism are the subject of lively debate in Turkey's political life. The current ruling AK Party comes from a tradition that challenges many of the Kemalist precepts and is driven in its reform efforts by a desire to achieve European Union (EU) accession.

Turkey entered World War II on the Allied side until shortly before the war ended, becoming a charter member of the United Nations. Difficulties faced by Greece after World War II in quelling a communist rebellion and demands by the Soviet Union for military bases in the Turkish Straits prompted the United States to declare the Truman Doctrine in 1947. The doctrine enunciated American intentions to guarantee the security of Turkey and Greece and resulted in large scale U.S. military and economic aid under the Marshall Plan. After participating with United Nations forces in the Korean conflict, Turkey in 1952 joined the North Atlantic Treaty Organization (NATO). Turkey is currently a European Union candidate.