1. Michigan enters the Union: September 1, 1837 marked a significant moment in Michigan history as it officially became the 26th state to enter the Union. This was after a long process that involved the Toledo War with Ohio and a referendum voted by the residents of Michigan to become a state.

2. The Battle of Pine River: On September 1, 1855, a fight broke out between the Saginaw Chippewa Tribe and loggers who had established camps on tribal lands in central Michigan. The conflict resulted in the death of several people on both sides, including Chief Shawano, and became known as the Battle of Pine River.

3. Detroit Tigers win an American League pennant: September 1, 1907, marked a historic moment for the Detroit Tigers baseball team as they clinched their first-ever American League pennant. The team went on to play in the World Series but lost to the Chicago Cubs.

4. Michigan's 9/11 Memorial: On September 1, 2011, a memorial for the victims of 9/11 was unveiled in Michigan's Memorial Park. The memorial features two 14-foot tall steel beams from the World Trade Center, a flagpole with a piece of limestone from the Pentagon, and soil from the Shanksville, Pennsylvania crash site.

5. Michigan's first mass shooting: On September 1, 1993, a disgruntled employee at a GM plant in Wyoming, Michigan, opened fire on his co-workers, killing two and injuring several others. This incident was the first mass shooting in Michigan history and sparked a debate about gun control laws in the state.