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| YEAR | DATE | EVENT | GOVERNOR |
| 1858 | Part of Kansas | ||
| 1861 | 28 february | U.S. Territory | William Gilpin |
| 1862 | John Evans | ||
| 1865 | Alexander Cummings | ||
| 1867 | Alexander Cameron Hunt | ||
| 1869 | Edward M. McCook (I) | ||
| 1873 | Samuel H. Elbert | ||
| 1874 | Edward M. McCook (II) | ||
| 1875 | John L. Routt | ||
| 1876 | 1 august | 38^ state of USA |
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| YEAR | DATE | EVENT |
| 1911 | 5 june |
| YEAR | DATE | EVENT |
| 1931 | 31 march |