1. In 1805, the Lewis and Clark expedition camped near present-day Calvert Creek in Montana. The explorers were on their way back east after reaching the Pacific Ocean and spent the winter in the area, encountering many Native American tribes.

2. On December 27, 1864, a group of Cheyenne and Sioux warriors attacked a Union Pacific train near Julesburg, Colorado. The attack was part of ongoing conflicts between Native American tribes and encroaching white settlers, and the incident became known as the Battle of Julesburg.

3. In 1890, the last major conflict between US troops and Native American tribes occurred at Wounded Knee, South Dakota. Many Montana tribes were involved in the conflict, which resulted in the deaths of around 300 Lakota people and marked the end of the Indian Wars.

4. On December 27, 1935, the Montana state legislature approved a bill to establish the Montana State Fair. The annual event has continued for over 80 years and attracts visitors from across the state and beyond.

5. In 1981, the Unabomber, Theodore Kaczynski, killed his first victim, Hugh Scrutton, in Sacramento, California. Kaczynski, a former mathematics professor, was arrested in Montana in 1996 and pled guilty to a series of bombings that killed three people and injured dozens more.