Colorado; -- a nickname alluding to the fact that it was admitted to the Union in the centennial year, 1876.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). centennial state. Retrieved September 24, 2026, from http://smartdefine.org/centennial_state/definitions/1985716 |
| Chicago | Webster's. 2011. "centennial state" http://smartdefine.org/centennial_state/definitions/1985716 (accessed September 24, 2026). |
| Harvard | Webster's 2011, centennial state, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/centennial_state/definitions/1985716>. |
| MLA | Webster's. "centennial state" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/centennial_state/definitions/1985716> |