1. In 1937, a school explosion in New London, Texas killed 298 people, including several Colorado residents. The tragedy sparked nationwide awareness and improved safety standards for school buildings.

2. Denver hosted the 24th Democratic National Convention on March 18, 1908, where William Jennings Bryan was nominated for president for the third time.

3. In 1965, the first section of Interstate 25 was completed in Colorado, connecting Denver to Colorado Springs. Today, I-25 is one of the busiest highways in the state.

4. On March 18, 1873, the Colorado General Assembly approved the formation of Boulder County from parts of four other counties. Boulder County is now home to the University of Colorado and is known for its outdoor recreation opportunities.

5. The Denver Broncos made a significant trade on March 18, 2009, acquiring quarterback Kyle Orton from the Chicago Bears in exchange for Jay Cutler, which ultimately led to the Broncos winning the AFC West later that year.