1. In 1864, the Battle of Platte Bridge Station took place in Wyoming (which was then part of Colorado Territory) during the American Civil War. The battle saw Union forces defeat Confederate raiders led by Colonel John S. Mosby.

2. The first traffic light in Colorado was installed on June 30, 1932, at the intersection of Broadway and Colfax in Denver. The light was manually operated by a police officer until it became automated in 1947.

3. On June 30, 1965, the United States Supreme Court ruled in Griswold v. Connecticut that laws prohibiting the use of contraceptives violated the right to privacy. This landmark decision paved the way for the legalization of birth control and other reproductive rights.

4. In 1976, the Colorado Supreme Court ruled in Taylor v. People that the state's death penalty was unconstitutional. The ruling was based on the argument that the death penalty was too arbitrary and discriminatory in its application.

5. On June 30, 1993, the deadliest wildfire in Colorado history began in Storm King Mountain near Glenwood Springs. Fourteen firefighters lost their lives battling the blaze, which ultimately burned over 2,100 acres. The tragedy prompted new safety standards and protocols for the firefighting industry.