1. Montana's Constitution was written on September 29, 1972.

September 29, 1972, marked the final day of the Montana Constitutional Convention, where delegates had been working to draft a new state constitution. After months of debate and compromise, the final version was approved by a vote of 80-15. Montana's current Constitution remains a landmark achievement in state history.

2. Montana's Lewis and Clark Expedition reached the Three Forks on September 29, 1806.

Almost four years after leaving St. Louis, Missouri, the Lewis and Clark Expedition reached the Three Forks of the Missouri River in Montana. This marked the point where the expedition recognized they were finally on the homestretch of their journey back to the United States.

3. The University of Montana was founded on September 29, 1893.

September 29, 1893, marks the founding date of the University of Montana, originally known as Montana State University. Today, the university is an important cultural and academic hub in the state, offering more than 220 programs of study to over 15,000 students.

4. A deadly coal mine explosion occurred on September 29, 1938.

On this day in 1938, a massive coal dust explosion occurred at the Montana Coal and Iron Company's Smith Mine in Bearcreek, Montana, killing 74 people. It remains one of the worst mining disasters in United States history.

5. The first LGBTQ+ pride parade was held in Missoula on September 29, 1991.

Missoula became the first city in Montana to hold an LGBT pride event when it hosted a local march in 1991. The parade was organized by the Montana Human Rights Network to provide visibility and support for the LGBTQ+ community in the state. Today, cities across Montana hold pride events annually.