1. On October 4, 1836, the Treaty of the Cedars was signed between the United States and the Chippewa Indians. Under the treaty, the Chippewa ceded millions of acres of land in Wisconsin and Minnesota to the U.S. government in exchange for annuities, goods, and hunting and fishing rights.

2. The first issue of the Milwaukee Sentinel was published on October 4, 1837. The newspaper, which is still in circulation today, was founded by Solomon Juneau and John O'Rourke and served as a voice for the Democratic Party in Wisconsin during its early years.

3. On October 4, 1877, the deadliest railroad accident in Wisconsin history occurred when a Chicago & North Western Railway train collided with a Milwaukee & St. Paul Railway train near Waukesha. More than 80 people were killed and hundreds more were injured in the crash.

4. University of Wisconsin-Madison professor Harry Steenbock discovered the process for fortifying milk with Vitamin D on October 4, 1923. The discovery led to the eradication of rickets, a bone disease, in children and the fortification of many foods with Vitamin D today.

5. On October 4, 2007, the Green Bay Packers retired Brett Favre's jersey number, 4, during a halftime ceremony at Lambeau Field. Favre played for the Packers from 1992 to 2007 and led the team to a Super Bowl victory in 1997. He is considered one of the greatest quarterbacks in NFL history.