The Ottoman Empire grew powerful under Suleiman the Great in the 16th century through military conquests. However, the Empire began declining in the 17th century due to military defeats, weak rulers, and internal revolts. The Tanzimat reforms in the 1850s failed to stop the decline due to continued losses and revolts. After World War 1, the Ottoman Empire was partitioned and the new nation of Turkey was formed under Mustafa Kemal Ataturk, who modernized Turkey and established it as a secular Muslim state through his six principles of republicanism, reformism, nationalism, populism, statism, and secularism.