1. On April 21, 1836, Wisconsin Territory was established by an act of the United States Congress. This was a significant event in Wisconsin's history as it paved the way for statehood.

2. In 1862, the town of New Richmond was incorporated in Wisconsin. This town became known for its lumber industry and was also the site of a deadly tornado in 1899 that killed over 100 people.

3. Wisconsin's first state park, Interstate State Park, was established on April 21, 1900. Located along the St. Croix River, the park is known for its unique geological formations and scenic beauty.

4. On April 21, 1971, Wisconsin became the first state in the United States to implement a state-wide recycling program. This initiative aimed to reduce waste and promote environmental sustainability.

5. In 2015, the Milwaukee Brewers played their 5,000th game in Wisconsin on April 21. The Brewers are a Major League Baseball team based in Milwaukee and have been a significant part of Wisconsin's sports culture since their inception in 1969.