1. On August 20, 1852, the Milwaukee Road Railroad was chartered, connecting Milwaukee to the Mississippi River. The railroad played a significant role in the growth and development of Wisconsin's economy.

2. In 1920, on August 20, the 19th Amendment to the U.S. Constitution was ratified, granting women the right to vote. Wisconsin was the first state to ratify the amendment.

3. On August 20, 1954, the first commercial jet aircraft service began between Milwaukee and New York City. This marked an important moment in air travel history and expanded transportation options for Wisconsin residents.

4. In 1986, on August 20, the Milwaukee Brewers' outfielder Robin Yount hit his 200th career home run, becoming the first player in Brewers history to reach this milestone. Yount was inducted into the Baseball Hall of Fame in 1999.

5. August 20, 1999, was a significant day for Wisconsin's space exploration history. Astronaut Jim Lovell, a native of Wisconsin, was awarded the Congressional Space Medal of Honor for his achievements in space travel, including his famous Apollo 13 mission.