Atatürk's Reforms () were a series of political, legal, religious, cultural, social, and economic policy changes, designed to convert the new Republic of Turkey into a secular, modern nation-state, implemented under the leadership of Mustafa Kemal Atatürk in accordance with the Kemalist ideology. His political party, the Republican People's Party (CHP) ran Turkey as a one-party-state, implemented these reforms starting in 1923. After Atatürk's death, his successor İsmet İnönü, continued one-party rule and Kemalist style reforms until the CHP lost to the Democrat Party in Turkey's second, truly multi-party election in 1950. Central to the reforms was the belief that Turkish society had to modernize or more bluntly "westernize". This meant implementing widespread reform impacting not only politics, but the economic, social, educational and legal spheres of Turkish society. The reforms involved a number of fundamental institutional changes that brought an end to many traditions, and followed a carefully planned program to unravel the complex system that had developed over previous centuries. The reforms began with the modernization of the constitution, including enacting the new Constitution of 1924 to replace the Constitution of 1921, and the adaptation of European laws and jurisprudence to the needs of the new republic. That was followed by a thorough secularization and modernization of the administration, with particular focus on the education system. The elements of the political system visioned by Atatürk's Reforms developed in stages, but by 1935, when the last part of the Atatürk's Reforms removed the reference to Islam in the Constitution; Turkey became a secular (2.1) and democratic (2.1), republic (1.1) that derives its sovereignty (6.1) from the people. Turkish sovereignty rests with the Turkish Nation, which delegates its will to an elected unicameral parliament (position in 1935), the Turkish Grand National Assembly. The preamble also invokes the principles of nationalism, defined as the "material and spiritual well-being of the Republic" (position in 1935). The basic nature of the Republic is laïcité (2), social equality (2), equality before law (10), and the indivisibility of the Republic and of the Turkish Nation (3.1)." Thus, it sets out to found a unitary nation-state (position in 1935) with separation of powers based on the principles of secular democracy. Historically, Atatürk's reforms follow the Tanzimât ("reorganization") period of the Ottoman Empire, that began in 1839 and ended with the First Constitutional Era in 1876, Abdul Hamid II's authoritarian regime from 1878–1908 that introduced large reforms