When was the Ottoman Empire dissolved?

The Ottoman Empire ended in 1922 following the First World War and the partitioning of the Empire among the Allied Powers. In October 1918 the "Armistice of Mudros" was signed by representatives of Great Britain and the Ottoman Empire, ending hostilities between the allies and the Ottoman Empire. The Treaty of Sèvres was signed in August 1920 by the representatives of four of the allied powers and the Ottomans. This treaty divided non-Turkish territories controlled previously by the Ottomans among Britain and France (now part of modern-day Syria, Iraq, Jordan, Israel and Lebanon), as well as established zones of influence in the remaining portion of the empire and the occupation of the capital, Constantinople.

As part of the treaty the Sultan was allowed to remain, however backlash over the treaty and occupation led to the establishment of a Turkish national movement and plunged Turkey into a war for independence that lasted between 1919 and 1923. The war expelled the allied occupation and zones of influence, abolished the sultanate and created the Republic of Turkey. The empire formally ended when the last sultan, Mehmed VI, was expelled from the country in November 1922. The Republic of Turkey was formally established in 1923 with Mustafa Kemal (known later as Atatürk) as president.