1. On March 21, 1843, Wisconsin Territorial Governor James Duane Doty signed a bill authorizing the construction of a railroad from Milwaukee to Mississippi. This was the first railroad authorized by the Wisconsin Territorial Legislature.

2. The University of Wisconsin-Madison was founded on March 21, 1861, with the signing of the Morrill Act by President Abraham Lincoln. This act provided federal lands to states to establish colleges and universities with a focus on agriculture and mechanical arts.

3. The first state capitol building in Madison, Wisconsin, burned down on March 21, 1904. The fire destroyed the building and many valuable documents and artifacts. The current capitol building was completed in 1917.

4. On March 21, 1925, the Wisconsin State Journal published an editorial advocating for the creation of a state park system. This editorial eventually led to the establishment of Wisconsin's first state park, Peninsula State Park, in 1909.

5. Wisconsin native and famous architect Frank Lloyd Wright was born on March 21, 1867, in Richland Center. Wright went on to design many iconic buildings, including the Guggenheim Museum in New York City and Fallingwater in Pennsylvania.