1. Wisconsin became a state: On March 15, 1848, Wisconsin was officially admitted as the 30th state in the United States. Prior to this, it was a territory of the United States.

2. First white settler: On March 15, 1795, Piper Davis became the first white settler in what is now Kenosha County, Wisconsin. He established a trading post near the mouth of the Pike River, which he later sold to the infamous fur trader John Jacob Astor.

3. Women's suffrage: On March 15, 1913, over 2,000 women marched through the streets of Milwaukee to demand the right to vote. This was part of a national movement for women's suffrage, which eventually led to the passage of the 19th Amendment to the U.S. Constitution in 1920.

4. Wisconsin's first brewery: On March 15, 1840, Charles Minahan opened Wisconsin's first brewery in Mineral Point. This was the beginning of what would become a booming industry in Wisconsin, with Milwaukee becoming known as the "beer capital of the world."

5. University of Wisconsin-Madison founded: On March 15, 1848, the Wisconsin Territorial Legislature signed the charter for the University of Wisconsin-Madison, originally known as the University of the Territory of Wisconsin. Today, UW-Madison is one of the largest and most prestigious universities in the United States.