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World War I and the Hashemite Kingdom

During World War I, Sharif Hussein bin Ali declared a revolt against the Ottoman Empire, seeking independence from the Ottoman Turks and the creation of a single unified Arab state spanning from Aleppo in Syria to Aden in Yemen.

King Hussein declared the Kingdom of Hejaz. Later, Hussein was involved in a war with Ibn Saud, who was the Sultan of Nejd. Hussein abdicated following the fall of Mecca, in December 1924, and his son Ali bin Hussein became the new king.