1. In 1787, the Treaty of Fort Pitt was signed on September 24 between the United States and several Native American tribes, including the Ojibwe, Chippewa, and Ottawa. This treaty allowed for American settlement in the Ohio River Valley and the Northwest Territory, which included what is now Minnesota.

2. On September 24, 1887, the first train crossed the newly constructed Stone Arch Bridge in Minneapolis, which spanned the Mississippi River. The bridge was designed by a team of railroad engineers led by James J. Hill, and was a marvel of late 19th century engineering.

3. In 1903, a severe hailstorm struck southern Minnesota on September 24, causing extensive crop damage and resulting in the deaths of several people. The storm was one of the most destructive in Minnesota history, with hailstones the size of baseballs reported in some areas.

4. September 24, 1954 marked the opening of the University of Minnesota's new stadium, Memorial Stadium, which replaced the team's previous home field, Northrop Field. The stadium served as the home of Golden Gophers football until TCF Bank Stadium opened in 2009.

5. On September 24, 2004, Minnesota became the first state in the nation to ban smoking in all workplaces, including bars and restaurants. The statewide ban was a major victory for anti-smoking advocates, and paved the way for similar laws in other states across the country.