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In page Tucson, Arizona:

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During the Mexican–American War in 1846–1848, Tucsón was captured by Philip St. George Cooke with the Mormon Battalion, but it soon returned to Mexican control as Cooke proceeded to the west, establishing Cooke's Wagon Road to California. Tucsón was not included in the Mexican Cession to the United States following the war. Cooke's road through Tucsón became one of the important routes into California during the California Gold Rush of 1849.[citation needed]