History

• Colorado was a Territory of Kansas and Territory of Jefferson.
• U.S. Territory of Colorado was organized in 1861
• The Colorado War (1863–1865) was an armed conflict between the United States and a loose alliance among the Kiowa, Comanche, Arapaho, and Cheyenne nations (the last two were particularly closely allied)
• On August 1, 1876, Colorado was admitted as a state, maintaining its territorial borders