1. On March 9, 1915, the Colorado National Guard was activated to quell a labor strike in the Ludlow coal mining area. This resulted in the Ludlow Massacre, one of the deadliest incidents of labor violence in U.S. history.

2. On March 9, 1931, Colorado's first ski lift officially opened at the top of Berthoud Pass. This marked the beginning of the state's thriving ski industry, which boasts some of the world's most popular resorts.

3. Denver's famous Brown Palace Hotel was the site of the first public demonstration of an automobile in Colorado on March 9, 1903. A car was driven through the hotel's lobby to showcase the new technology to curious onlookers.

4. On March 9, 1974, legendary musician John Denver performed a benefit concert at Denver's McNichols Arena to raise funds for a new planetarium. The event was a huge success, and the planetarium was subsequently built.

5. The Colorado Avalanche won their first Stanley Cup on March 9, 1996. The team defeated the Florida Panthers in a hard-fought series, cementing their place in Colorado sports history.