1. In 1877, the first ever statewide fair was held in Wisconsin on September 23. It was held in Janesville and was known as the "Wisconsin State Agricultural Society Fair."

2. On September 23, 1919, the first transcontinental airmail flight landed in Milwaukee, Wisconsin. This flight was a major milestone in aviation history, as it proved that air transportation for mail delivery was feasible on a national scale.

3. The Wisconsin State Capitol building was dedicated on September 23, 1917. The building, located in Madison, serves as the center of government for the state and has become a prominent landmark in Wisconsin.

4. In 1950, Wisconsin native Al Jarreau, a multiple Grammy award-winning jazz singer, was born on September 23. Jarreau has been recognized for his unique vocal style, which incorporates elements of jazz, R&B, and pop music.

5. On September 23, 1862, the Battle of Wood Lake took place near present-day Granite Falls, Minnesota. Wisconsin troops, under the command of Colonel Henry Sibley, played a significant role in the Union victory against the Dakota Indians. The battle was one of the final conflicts of the Dakota War of 1862.