1. On March 20, 1854, the Republican Party was officially founded in Ripon, Wisconsin. A group of anti-slavery activists came together to form a new political party that would oppose the expansion of slavery into new territories.

2. March 20, 1919, marks the day that Wisconsin ratified the 19th Amendment, which granted women the right to vote. Wisconsin was the first state to ratify the amendment, which was later officially adopted by the U.S. Congress.

3. In 1964, the first Ford Mustang was introduced at the New York World's Fair. The Mustang, which was designed by Wisconsin native Lee Iacocca, quickly became an American icon and remains a popular car to this day.

4. March 20, 1977, marked the opening day of the Milwaukee County Zoo's Aquatic and Reptile Center. The center features a variety of aquatic animals, from penguins to sharks, and is a popular destination for families and school groups.

5. On March 20, 2012, the city of Wisconsin Rapids made headlines when it was forced to remove a 20-foot-tall sculpture of a thespian frog due to safety concerns. The sculpture, which depicts a frog wearing a top hat and holding a cane, had become a beloved symbol of the city and sparked a nationwide controversy when it was removed.