1. In 1877, the first train arrived in Trinidad, Colorado, on May 3, after the town had spent several years lobbying for a railroad connection. The arrival of the Denver and Rio Grande Railroad not only spurred economic growth but also transformed Trinidad into a major transportation hub in southern Colorado.

2. Colorado's U.S. Senator Gary Hart announced on May 3, 1987, that he was withdrawing from the 1988 presidential race, following allegations of extramarital affairs reported by the media. Hart's decision shocked the political world and led to a shift in media coverage of candidates' personal lives.

3. In May 3, 1926, the state's first radio broadcasting station, KFEL Radio, launched in Denver. The station's call letters stood for "Kendall Future Education League" and it broadcast educational programming to schools throughout Colorado.

4. On May 3, 1968, civil rights leader Dr. Martin Luther King Jr.'s widow, Coretta Scott King, spoke to a crowd of 10,000 people at the University of Colorado Boulder. She called for an end to the Vietnam War and urged the crowd to continue fighting for civil rights.

5. In 1999, the Colorado Avalanche won Game 5 of the Western Conference Semifinals over the Detroit Red Wings in a memorable game dubbed "The Claude Lemieux Game." Avalanche player Claude Lemieux scored the winning goal in the second overtime period, helping the team win the series and eventually the Stanley Cup Championship.