1. On June 23, 1862, the Battle of Beaver Dam Creek took place during the American Civil War. Union troops under General Fitz John Porter won a decisive victory against Confederate forces led by General Thomas J. "Stonewall" Jackson.

2. The Milwaukee Brewers baseball team played their first game at Miller Park on June 23, 2001. The new stadium was built to replace the team's former home, County Stadium, and features a retractable roof and other state-of-the-art amenities.

3. On June 23, 1972, the Clean Water Act was signed into law by President Richard Nixon. The act established regulations to protect the quality of the nation's waterways and has been instrumental in improving water quality in Wisconsin and across the country.

4. The Wisconsin Flag was officially adopted on June 23, 1913. The flag features the state motto "Forward" and a shield with symbols representing the state's natural resources, including mining, agriculture, and forestry.

5. On June 23, 1939, the Milwaukee Zoo opened to the public. The zoo is home to over 3,300 animals representing more than 375 species, and is one of the most popular tourist attractions in the state.