1. In 1919, Wisconsin became the first state to ratify the 18th Amendment, which prohibited the manufacture, sale, and transportation of intoxicating liquors in the United States. This amendment led to the era of Prohibition, which lasted from 1920 to 1933.

2. On January 15, 1913, Illinois and Wisconsin signed a compact that designated the border between the two states through Lake Michigan. The agreement also clarified the boundary between the two states on land.

3. In 1966, the Milwaukee Bucks played their first game at the Milwaukee Arena, now known as the UW-Milwaukee Panther Arena. The team was founded by businessman Wesley Pavalon and NBA legend Lew Alcindor, who later changed his name to Kareem Abdul-Jabbar.

4. On January 15, 1908, the University of Wisconsin established the country's first college course in forestry. The course was offered in response to growing concerns about deforestation and habitat loss.

5. In 1978, the National Weather Service recorded the lowest temperature ever recorded in Wisconsin: -55 degrees Fahrenheit in the village of Couderay. This temperature tied the state record for lowest temperature previously set in the village of Green Bay in 1936.