Territorial evolution of Arizona

Updated on Dec 30, 2024

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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 acres (2.361 km²), a part of the Cocopah Indian Reservation at 32°37′27″N 114°46′45″W, was ceded to the U.S. with controversy. Fain Banco (259 acres (1.05 km²)) at 32°31′32″N 114°47′28″W also became U.S. soil.

References

Territorial evolution of Arizona Wikipedia

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