One-party period of the Republic of Turkey the Liberal Republican Party was established but dissolved by its founder. The Progressive Republican Party had also been established in 1924 by Kazım Karabekir, but was banned after its members' involvement in the 1925 Sheikh Said rebellion. Despite Atatürk's efforts in establishing a self-propagating multi-party system during his presidency, this was only established after his death in 1938. With the establishment of the Republic of Turkey, efforts to modernize the country began. The institutions and constitutions of Western states such as France, Sweden, Italy, and Switzerland were analyzed and adapted according to the needs and characteristics of the Turkish nation.
Turkey aged 65 years or older make up 7.3 percent. In 1927, when the first official census was recorded in the Republic of Turkey, the population was 13.6 million. The largest city in Turkey, Istanbul, is also the largest city in Europe in population, and the third-largest city in Europe in terms of size. Article 66 of the Turkish Constitution defines a "Turk" as "anyone who is bound to the Turkish state through the bond of citizenship"; therefore, the legal use of the term "Turkish" as a citizen of Turkey is different from the ethnic definition. However, the majority of the