1. In 1855, the Treaty of Hell Gate was signed between the United States government and several Native American tribes in Montana. The treaty established reserved lands and rights for the tribes, but also opened up the area for white settlement.

2. In 1874, the Battle of the Rosebud took place near present-day Busby, Montana. The battle was between the United States Army and several Native American tribes, and was one of several conflicts leading up to the infamous Battle of Little Bighorn.

3. In 1910, the Elk River Coal Mining Disaster occurred near the town of Roslyn, Montana. The disaster claimed the lives of 45 miners and led to significant changes in mining safety regulations.

4. In 1934, Montana Governor Frank Cooney was removed from office by the state legislature for allegedly accepting bribes. Cooney was the first governor in Montana history to suffer such a fate.

5. In 1997, the Montana State Capitol building was severely damaged by a fire. The building, which had stood since 1902, was largely destroyed but was later rebuilt and restored to its former glory.