1. On December 28, 1917, the Colorado Fuel and Iron Company was charged with violating the Espionage Act during World War I. The company was accused of obstructing the draft and promoting sabotage activities against the government. The trial lasted for nine months and resulted in the conviction of several of the company's executives.

2. In 1926, the Colorado state legislature passed a bill creating Mesa Verde National Park. The park, located in the southwestern part of the state, protects some of the best-preserved ancient Native American cliff dwellings in the country. Today, the park attracts thousands of visitors each year.

3. On December 28, 1962, a major blizzard hit eastern Colorado. The storm dropped over two feet of snow in some areas and caused widespread damage and power outages. Many highways and roads were closed for days, and several towns were effectively cut off from the outside world.

4. In 1973, the Colorado Supreme Court declared the state's death penalty law unconstitutional. The decision was based on the grounds that the law allowed for arbitrary and capricious imposition of the death penalty. The ruling effectively abolished the death penalty in Colorado until it was reinstated in 1975.

5. On December 28, 2006, the Denver Broncos defeated the San Francisco 49ers in a regular-season NFL game. The game was notable for several reasons, including being played on a Thursday night and featuring star quarterback Peyton Manning. The Broncos would go on to make the playoffs that season, but were defeated in the divisional round by the Indianapolis Colts.