1. The City of Leadville was founded on July 6, 1877. This historic mining town played a significant role in Colorado's early mining industry and is home to many preserved Victorian-era buildings.

2. On July 6, 1924, President Calvin Coolidge signed the Indian Citizenship Act, granting citizenship to all Native Americans born in the United States. This act marked an important milestone in civil rights and recognition for Native Americans.

3. Colorado became a state on August 1, 1876, but the official state holiday, Colorado Day, is celebrated on the first Monday of August each year. However, on July 6, 2006, the Colorado Rockies played the longest game in franchise history, lasting 18 innings against the San Diego Padres.

4. The famous ballad "The Colorado Trail" was written by a former Colorado state senator, Eugene Rhodes, on July 6, 1925. The song celebrates the beauty of the Colorado wilderness and has since become an iconic folk song in the state.

5. On July 6, 1985, NASA astronaut Vance Brand became the first person to pilot two different Space Shuttle vehicles when he commanded the Challenger on its ninth mission. Brand, a native of Colorado, went on to pilot two more Shuttle missions and retire with the rank of Brigadier General in the Air Force Reserve.