1. On May 9, 1848, Wisconsin became the 30th state to join the United States. The state's admission to the Union meant that it would be represented in Congress and have equal standing with other states in matters of governance.

2. In 1926, May 9 was officially designated as Wisconsin Day by a joint resolution of the state legislature. The day is intended to celebrate Wisconsin's heritage, culture, and people.

3. May 9, 1912 marked the opening of the Wisconsin State Capitol building in Madison. The architecture of the building is modeled after the U.S. Capitol in Washington, D.C., and it remains one of the most recognizable landmarks in the state.

4. On May 9, 1979, a major tornado outbreak struck parts of Wisconsin. The storms caused extensive damage and killed at least three people.

5. May 9, 1992 was a memorable day in Wisconsin sports history, as the Milwaukee Brewers played their first game at the newly-built Miller Park. The stadium, which features a retractable roof and seating for more than 40,000 fans, remains home to the Brewers today.