William Dalrymple (historian)

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

• 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^[1]
    • 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 / 32.62417°N 114.77917°W / 32.62417; -114.77917, was ceded to the U.S. with controversy.^[2] Fain Banco (259 acres (1.05 km²)) at 32°31′32″N 114°47′28″W / 32.52556°N 114.79111°W / 32.52556; -114.79111 also became U.S. soil.

• History of Arizona
• Territorial evolution of the United States

Territorial evolution of California

List of territorial claims and designations in Colorado

Territorial evolution of Nevada

Territorial evolution of New Mexico

Territorial evolution of Utah