Portal:Colorado/Did You Know/2
- President Theodore Roosevelt signed an act of Congress creating Mesa Verde National Park on June 29, 1906.
- Denver International Airport opened on June 11, 1995.
- On November 15, 1902, Arapahoe County was split into three new counties: the City and County of Denver, Adams County, and South Arapahoe County.
- The State of Colorado had three Governors on March 17, 1905.
- The first National Western Stock Show opened in Denver on January 29, 1906.
- The Democratic National Convention meeting in Denver nominated William Jennings Bryan for President of the United States on July 10, 1908.
- President Woodrow Wilson signed an act of Congress creating Rocky Mountain National Park on January 26, 1915.
- Mamie Geneva Doud married U.S. Army lieutenant (and later General of the Army and President of the United States) Dwight Eisenhower in Denver on July 1, 1916.
- The population of Colorado first exceeded one million in 1929.
- Denver Municipal Airport opened on October 17, 1929.
- In 1942, Governor Ralph Carr welcomed Japanese-Americans to Colorado despite the war with Japan.
- The first class of the United States Air Force Academy graduated on June 3, 1959.
- UNESCO designated Mesa Verde National Park as one of the original 12 World Heritage Sites on October 9, 1978.
- John Hickenlooper, later a Colorado Governor and United States Senator, founded a popular Denver brewpub in 1988.
- The Denver Broncos won the NFL Super Bowl in 1998, 1999, and 2016.
- President Bill Clinton signed an act of Congress elevating the national monument to Black Canyon of the Gunnison National Park on October 21, 1999.