1. Missouri officially became a state on October 1, 1821. After being part of the Louisiana Territory and then the Missouri Territory, Missouri was admitted to the Union as the 24th state.

2. The Missouri Pacific Railroad was organized on October 1, 1872. This railroad company played a significant role in the development of Missouri's transportation and economy in the late 19th and early 20th centuries.

3. In 1964, the St. Louis Cardinals won their first World Series championship in franchise history on October 1. They defeated the New York Yankees in a seven-game series.

4. On October 1, 1927, the brand new Municipal Auditorium in Kansas City was officially opened. This 10,500-seat venue became a major location for concerts and events in the region.

5. The Missouri State Capitol building was completed on October 1, 1917, after eight years of construction. The building, which features a dome inspired by St. Peter's Basilica in Rome, remains one of the most recognizable landmarks in Missouri's capital city of Jefferson City.