1. On July 21, 1864, the Battle of the Big Hole took place in southwestern Montana. U.S. Army troops attacked a camp of Nez Perce Indians, resulting in significant casualties on both sides.

2. In 1936, the town of Radersburg, Montana, experienced a massive fire that destroyed many of its buildings. It was one of the worst fires in Montana history at the time.

3. On July 21, 1983, the first concert was held at the newly-built Rimrock Auto Arena in Billings, Montana. The arena has since become a popular venue for concerts and other events.

4. In 2000, Montana became the first state in the country to allow online voting in a general election. The pilot program was only available to overseas military personnel, but it marked a significant step forward for election technology.

5. On July 21, 1971, the Missoula City Council voted to officially change the name of South Avenue to Higgins Avenue. The change was made in honor of businessman and former Missoula mayor Frank Higgins, who had helped to develop the area. Today, Higgins Avenue is one of the most prominent streets in the city.