1. In 1822, the first steamboat to travel up the Missouri River, the Independence, arrived at Franklin, Missouri. This marked a significant development in transportation and trade for the state, allowing for faster and more efficient travel and trade along the river.

2. On September 7, 1861, the Battle of Dry Wood Creek took place near the town of Nevada, Missouri, during the American Civil War. The battle resulted in a Confederate victory and allowed them to continue their advance into Missouri.

3. In 1925, Walter Elias Disney, better known as Walt Disney, founded his first animation studio, Laugh-O-Gram Studio, in Kansas City, Missouri. This studio produced several short films and cartoons before going bankrupt in 1923, prompting Disney to move to California and establish what would become the Walt Disney Company.

4. On September 7, 1963, the Gateway Arch in St. Louis, Missouri, was completed after several years of construction. Standing at 630 feet tall, this iconic monument is the world's tallest arch and serves as a symbol of the westward expansion of the United States.

5. In 1986, Kansas City, Missouri, became the first major U.S. city to enact a smoking ban in public places, including restaurants and bars. This move sparked a nationwide trend towards smoking bans in public spaces and helped to improve public health outcomes.