During the Ottoman occupation of Iraq until the partition of the Ottoman Empire in the 20th century, Iraq was made up of three provinces, called vilayets in the Ottoman Turkish language: Mosul Vilayet, Baghdad Vilayet, and Basra Vilayet. In April 1920 the British Mandate of Mesopotamia was created under the authority of the League of Nations. A British-backed monarchy joining these ''vilayets'' into one Kingdom was established in 1921 under Faisal I of Iraq. The Hashemite Kingdom of Iraq gained independence from the UK in 1932. In 1958, the monarchy was overthrown and the Iraqi Republic created. Iraq was controlled by the Arab Socialist Ba'ath Party from 1968 until 2003. In 1980, Iraq invaded Iran, sparking a protracted war which would last for almost eight years, and end in a stalemate with devastating losses for both countries.