1. On April 9, 1865, Wisconsin soldiers played a significant role in ending the Civil War by capturing Confederate General Robert E. Lee at the Appomattox Courthouse in Virginia.

2. On April 9, 1917, Wisconsin National Guard troops were mobilized for service in World War I, marking the state's entry into the conflict.

3. On April 9, 1940, Wisconsin's first state park, Interstate State Park, was established in St. Croix Falls. Today, the park is home to unique geological formations and numerous recreational activities.

4. On April 9, 1966, the University of Wisconsin-Madison won its first NCAA men's basketball championship, defeating the University of Kentucky 71-65 in the final game.

5. On April 9, 2007, Wisconsin Governor Jim Doyle signed a bill banning smoking in all indoor public places, making Wisconsin the 24th state to enact such a law.