1. On July 20, 2012, Indianapolis native Lilly King won a gold medal in the 100-meter breaststroke at the Summer Olympics in Rio de Janeiro, Brazil. She set an Olympic record with a time of 1:04.93.

2. In 1969, the Apollo 11 spacecraft landed on the moon, and the first humans, Neil Armstrong and Buzz Aldrin, walked on its surface. Armstrong, a native of Wapakoneta, Ohio, graduated from Purdue University in Indiana and served as a professor at the university after his NASA career.

3. On July 20, 1822, the Indiana State Flag was adopted. The blue flag features a torch symbolizing liberty and enlightenment, and thirteen stars representing Indiana's place as the thirteenth state to join the Union.

4. On this day in 1864, Union troops led by William T. Sherman captured Atlanta, Georgia, a key Confederate stronghold in the Civil War. Many soldiers from Indiana fought in Sherman's army, including the 124th and 29th Indiana Infantry Regiments.

5. In 1913, the Indianapolis Streetcar Strike began on July 20 after workers demanded better pay and improved working conditions. The strike lasted for nearly three months and saw instances of violence and unrest in the city. Eventually, the workers' demands were met, and the strike ended on October 10.