1. On January 7, 1903, the Wisconsin State Legislature passed a law prohibiting the sale of margarine, a butter substitute made from vegetable oil, in the state unless it was clearly labeled as such. The law was in effect until 1967, when the federal government passed a law allowing the sale of colored margarine.

2. On January 7, 1913, Wisconsin's first female state senator, Ada L. James, took office. James was a leader in the women's suffrage movement and fought for women's rights and the elimination of child labor.

3. January 7, 1942, marked the first day of classes at the University of Wisconsin-Milwaukee, which was originally founded as an extension of the University of Wisconsin-Madison to serve the needs of Milwaukee's growing population.

4. January 7, 1994, was the date of the deadliest fire in Wisconsin's history. The fire at the New Year's Eve party in the third-floor apartment of a rooming house in Milwaukee resulted in the deaths of 10 people.

5. On January 7, 2019, Wisconsin Governor Tony Evers was sworn in, becoming the state's 46th governor. Evers previously served as the state's Superintendent of Public Instruction and campaigned on issues such as increasing funding for education and expanding health care coverage.