1. On July 11, 1821, Missouri was admitted as the 24th state in the United States of America. It was the first state located entirely west of the Mississippi River to be admitted.

2. On July 11, 1861, the first battle of the Civil War west of the Mississippi River took place in Carthage, Missouri. The Confederate army, led by Brigadier General Benjamin McCulloch, defeated the Union forces under Colonel Franz Sigel.

3. On July 11, 1899, William Clark, best known as the leader of the Lewis and Clark Expedition, died in St. Louis, Missouri. He was laid to rest in Bellefontaine Cemetery in St. Louis.

4. On July 11, 1916, a historic heat wave struck St. Louis, with temperatures reaching as high as 115 degrees Fahrenheit (46 degrees Celsius). The heat wave lasted for several days and resulted in over 500 deaths in the city.

5. On July 11, 1928, Walt Disney's cartoon character Mickey Mouse made his debut in the short film "Plane Crazy" at a theater in Hollywood, California. However, it wasn't until 1929 that Mickey Mouse cartoons were first shown in St. Louis theaters.