Territorial evolution of Arizona

The following timeline traces the territorial evolution of the U.S. State of Arizona.

Timeline

 * Historical territorial claims of Spain in the present State of Arizona:
 * Nueva Vizcaya, 1562–1821
 * Santa Fé de Nuevo Méjico, 1598–1821
 * Sonora y Sinaloa, 1732–1821
 * Treaty of Córdoba of 1821
 * Historical territorial claims of Mexico in the present State of Arizona:
 * Santa Fé de Nuevo México, 1821–1848
 * Sonora y Sinaloa (Estado de Occidente), 1824–1830
 * Sonora since 1830
 * Treaty of Guadalupe Hidalgo of 1848
 * Gadsden Purchase of 1853
 * Historical political divisions of the United States in the present State of Arizona:
 * Unorganized territory created by the Treaty of Guadalupe Hidalgo, 1848–1850
 * Compromise of 1850
 * State of Deseret (extralegal), 1849–1850
 * Territory of New Mexico, 1850–1912
 * Gadsden Purchase of 1853
 * American Civil War, 1861–1865
 * Arizona Territory (CSA), 1861–1865
 * Territory of Arizona, 1863–1912
 * North-western corner of the Arizona Territory is transferred to the State of Nevada, 1867
 * State of Arizona since February 14, 1912
 * Mexican Boundary Exchanges: In 1927 under the Banco Convention of 1905, the U.S. acquired two bancos from Mexico at the Colorado River border with Arizona. Farmers Banco, covering 583.4 acre, a part of the Cocopah Indian Reservation at 32.62417°N, -114.77917°W, was ceded to the U.S. with controversy.  Fain Banco (259 acre) at 32.52556°N, -114.79111°W also became U.S. soil.