1. On January 23, 1867, the University of Wisconsin was founded. It started out as a small college with just 10 students and two professors and has since grown into a major research university with a student population of over 40,000.

2. In 1915, the first American cheese factory was established in Wisconsin on January 23. Prior to this, most cheese in the United States was imported from Europe.

3. On January 23, 1849, Madison, Wisconsin became the state capital. Previously, the capital had been in Belmont and then moved to Burlington before settling in Madison.

4. Wisconsin's first indoor ice rink opened on January 23, 1899, in Milwaukee. The rink was built specifically for ice hockey games, which had become increasingly popular in the state.

5. On January 23, 1920, Wisconsin became the first state to ratify the 19th Amendment to the United States Constitution, which granted women the right to vote. This was a significant milestone in the women's suffrage movement.