page_title: Territorial evolution of Arizona
section_title: Timeline
hierarchical_section_title: Territorial evolution of Arizona / Timeline
caption_attribution_description: Map of the states and territories of the United States as it has been since August 21 1959, when Hawaii Territory was admitted as the state of Hawaii, completing the United States' present-day borders.
context_page_description: The following timeline traces the territorial evolution of the U.S. State of Arizona.
context_section_description: 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.
caption: An enlargeable map of the United States as it has been since 1959
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