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In page Arabian Peninsula:

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These events were followed by the foundation of Saudi Arabia under King Abdulaziz Ibn Saud. After the collapse of the Emirate of Diriyah, the House of Saud regrouped and in 1824 founded the Second Saudi State, which would control most of Arabia for the next two-thirds of a century. Ibn Saud, after his family lost power in 1891, would establish the Third Saudi State, capturing Riyadh in 1902, and, successively subduing Al-Hasa, Jabal Shammar and Hejaz between 1913 and 1926. The Saudis then absorbed the Emirate of Asir, with their expansion only ending in 1934 after a war with Yemen.[citation needed]