1. On September 21, 1905, the City of Detroit approved plans for the construction of the Michigan Central Station, which would become one of the city's most iconic landmarks. The station served as a hub for railroad passengers and was known for its grand Beaux-Arts architecture.

2. The Michigan State Fair, which was a beloved annual event in the state, held its last fair on September 21, 2009. The fair had been in operation for 161 years and featured agricultural exhibits, carnival rides, and live entertainment.

3. On September 21, 1949, groundbreaking ceremonies were held for the Mackinac Bridge, connecting Michigan's upper and lower peninsulas. The bridge was completed in 1957 and is one of the longest suspension bridges in the world.

4. In 1987, the Detroit Tigers clinched their division championship on September 21, marking the team's first postseason appearance in over a decade. The Tigers went on to win the American League Championship Series that year, but lost to the Minnesota Twins in the World Series.

5. The University of Michigan, one of the state's most prestigious institutions of higher learning, was founded on September 21, 1817. The university has since grown to become a renowned research institution and a top-ranked public university.