1. In 1944, the Battle of Leyte Gulf took place during World War II, with Missouri serving as the flagship for Admiral William F. Halsey, Jr. The battle saw the largest naval engagement in history and resulted in a decisive Allied victory.

2. In 1945, the United Nations officially came into existence, with Missouri Senator Harry S. Truman playing a key role in its formation. Truman would later become the 33rd President of the United States and oversee the end of World War II and the beginning of the Cold War.

3. In 1976, the St. Louis Cardinals won their first World Series title since 1967, defeating the New York Yankees in seven games. The Cardinals were led by pitcher Bob Gibson and outfielder Reggie Smith, both of whom would be inducted into the National Baseball Hall of Fame.

4. In 1995, the Kansas City Chiefs defeated the San Diego Chargers 29-23 in overtime in what is known as the "Monday Night Miracle." The win saw the Chiefs erase a 21-point deficit in the fourth quarter and is considered one of the greatest comebacks in NFL history.

5. In 2018, Missouri voters approved Amendment 2, legalizing medical marijuana in the state. The amendment allowed patients with qualifying conditions to purchase and use medical marijuana with a doctor's recommendation, making Missouri the 32nd state to legalize medical cannabis.