In the height of the Tanzimat period in 1876, Abdul Hamid II promulgated the Empire's first Constitution, which established the short First Constitutional Era and also featured elections for a parliament. Defeat in the 1877-1878 War with Russia and dissatisfaction with Abdul Hamid lead to the "temporary" suspension of the constitution and the parliament, resulting in a modern despotism/autocracy of Abdul Hamid, during which internal reform continued. The Young Turk Revolution in 1908 started the longer lasting Second Constitutional Era and forced Abdul Hamid to reinstate the constitution, recall the parliament, and hold elections again which this time which featured political parties. However, by 1913 the Ottoman Empire was a dictatorship of the Committee of Union and Progress (CUP) lead by the Three Pashas (Talat Pasha, Enver Pasha, and Cemal Pasha) and the world's first one party state. This dictatorship capitalized on the developed bureaucracy created through a century of reform and centralization by undertaking genocide against Christian minorities. The CUP also undertook many reforms relating to social structure, religion, and education, which would be continued and more far reaching under Mustafa Kemal Atatürk's regime. The Union and Progress dictatorship lasted until the end of World War I, which lead to the Empire's collapse and subsequent abolition by Turkish nationalist forces lead by Atatürk.