1. Montana becomes the 41st state: On July 1, 1889, Montana officially became the 41st state in the United States.

2. The establishment of Yellowstone National Park: On July 1, 1872, President Ulysses S. Grant signed into law the bill establishing Yellowstone National Park, the first national park in the world. The park covers over 2 million acres and is home to a diverse range of wildlife, geysers, and hot springs.

3. Montana State University is founded: On July 1, 1893, Montana State University was founded in Bozeman, Montana. The university is the state's largest institution of higher education and has produced notable alumni such as actor David Harbour and astronaut Loren Acton.

4. Montana Constitution adopted: On July 1, 1972, Montana adopted a new state constitution, replacing the previous version that had been in place since 1889. The new constitution established provisions for citizen initiatives and referendums and expanded rights for Native Americans.

5. Battle of the Big Hole: On July 1-2, 1877, the Battle of the Big Hole occurred in southwestern Montana during the Nez Perce War. U.S. Army troops attacked a camp of Nez Perce, resulting in the deaths of around 90 Native Americans and 29 soldiers. The site is now a National Historic Landmark.