1. Birth of Wisconsin's First Female Governor: On July 23, 1985, Mary Burke, the first female governor of Wisconsin, was born in Madison, Wisconsin. Burke, a businesswoman, philanthropist, and politician, was elected in 2014 as the Democratic candidate for Wisconsin governor.

2. Formation of the Green Bay Packers: On July 23, 1919, the Green Bay Packers football team was officially formed in Green Bay, Wisconsin. The team had its first season in 1921 and has since become one of the most successful franchises in the NFL.

3. Launch of the USS Wisconsin: On July 23, 1943, the USS Wisconsin battleship was launched from the Philadelphia Navy Yard. The ship, which served in World War II, the Korean War, and the Gulf War, is now a museum ship in Norfolk, Virginia.

4. First Republican State Convention: On July 23, 1854, Wisconsin held its first Republican State Convention in Madison. The convention was held in response to the passage of the Kansas-Nebraska Act, which allowed for the expansion of slavery into new territories.

5. Establishment of the University of Wisconsin-Milwaukee: On July 23, 1956, the University of Wisconsin-Milwaukee was established as a branch of the University of Wisconsin System. The school has since grown to become one of Wisconsin's largest public universities, with over 27,000 students.