Territorial evolution of Utah explained

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

Timeline

Historical territorial claims of Spain in the present State of Utah:
- Nueva Vizcaya, 1562–1821
- Santa Fé de Nuevo Méjico, 1598–1821
- Gran Cuenca, 1776–1821
  - Adams-Onís Treaty of 1819
  - Treaty of Córdoba of 1821
Historical territorial claims of Mexico in the present State of Utah:
- Santa Fé de Nuevo México, 1821–1848
- Gran Cuenca, 1821–1848
  - Treaty of Guadalupe Hidalgo of 1848
Historical political divisions of the United States in the present State of Utah:
- Unorganized territory created by the Treaty of Guadalupe Hidalgo, 1848–1850
  - Compromise of 1850
- State of Deseret (extralegal), 1849–1850
- Territory of Utah, 1850–1896
  - Utah Organic Act, September 9, 1850^[1]
  - Eastern portion of the Utah Territory is incorporated into the new Territory of Colorado, February 28, 1861
  - Western portion of the Utah Territory is incorporated into the new Territory of Nevada, March 2, 1861
  - North-eastern portion of the Utah Territory is transferred to the Territory of Nebraska, March 2, 1861
  - Western 53 miles of the Utah Territory is transferred to the Territory of Nevada, July 14, 1862
  - Another 53 miles of the Utah Territory is transferred to the State of Nevada, May 5, 1866
  - North-eastern corner of the Utah Territory is incorporated into the new Territory of Wyoming, July 25, 1868
  - Utah Enabling Act, July 16, 1894
- Territory of Jefferson (extralegal), 1859–1861
- State of Utah since January 4, 1896^[2]