1. Colorado became a state: On October 12, 1861, President Abraham Lincoln signed a bill admitting Colorado as the 38th state of the Union. The addition of Colorado was a critical turning point in the Civil War as it gave the Union army control over the gold and silver mines in the Rocky Mountains.

2. First brick building in Denver: On October 12, 1859, Denver's first brick building, Loveland Block, was completed. This historic building still stands at the corner of Wazee and 15th streets in Lower Downtown Denver and used to house the Tivoli Brewery.

3. First radio broadcast in Colorado: On October 12, 1921, the first radio broadcast in Colorado was aired by the Denver Post. The broadcast, which featured an address by then-Mayor Hale, was transmitted from the Denver Post headquarters.

4. Colorado Springs founded: On October 12, 1871, Colorado Springs was founded by General William Palmer, a Civil War hero, and railroad magnate. The city's location at the foot of Pikes Peak made it an ideal spot for tourism and outdoor recreation.

5. First-ever Skirt Dance: On October 12, 1892, the first-ever Skirt Dance was performed in Denver. The dance, performed by a group of 30 women, was a protest against petticoats that were uncomfortable and considered unhealthy for women. The Skirt Dance became a symbol of women's freedom and empowerment during the late 19th century.