The Unification of Saudi Arabia was a military and political campaign in which the various tribes, sheikhdoms, city-states, emirates, and kingdoms of most of the central Arabian Peninsula were conquered by the House of Saud, or Al Saud. Unification started in 1902 and continued until 1932, when the Kingdom of Saudi Arabia was proclaimed under the leadership of Abdulaziz, known in the West as Ibn Saud, creating what is sometimes referred to as the Third Saudi State, to differentiate it from the Emirate of Diriyah, the First Saudi State and the Emirate of Nejd, the Second Saudi State, also House of Saud states.
It has often been claimed that this process caused some 400,000 to 800,000 casualties. However, recent research suggests that though bloody, the number of deaths and injuries was significantly lower.[16]
^Peter W. Wilson, Douglas Graham. Saudi Arabia: the coming storm . M.E.Sharpe, 1994: p.45
^Leatherdale, Clive. Saudi Arabia, 1925–1939: the Imperial Oasis. p.115.
^Cite error: The named reference narrative was invoked but never defined (see the help page).
^Eden, Jeff (2019). "Did Ibn Saud's militants cause 400,000 casualties? Myths and evidence about the Wahhabi conquests, 1902–1925". British Journal of Middle Eastern Studies. 46 (4): 519–534. doi:10.1080/13530194.2018.1434612. S2CID149088619.