1. On April 3, 1826, the first steamboat arrived in St. Louis, Missouri. The steamboat, named the Enterprise, traveled upstream from New Orleans and marked the beginning of a new era of transportation and trade for the city.

2. In 1860, the Pony Express began operations in St. Joseph, Missouri, on April 3. The Pony Express was a mail delivery service that used horse-mounted riders to transport mail across the United States in record time. The service was short-lived, but it played an important role in the history of communication and transportation.

3. On April 3, 1882, Jesse James, notorious outlaw and native of Missouri, was shot and killed by Robert Ford in St. Joseph, Missouri. James was known for his daring bank and train robberies, and his death marked the end of an era for many who idolized him as a hero.

4. The Missouri State Capitol building was completed on April 3, 1917. The building, located in Jefferson City, Missouri, is a symbol of the state's history and government. It features magnificent architecture and serves as the home of the Missouri General Assembly and the governor's office.

5. Finally, on April 3, 1974, one of the largest tornado outbreaks in US history occurred in Missouri and other parts of the Midwest. The outbreak resulted in widespread damage and loss of life, with Missouri being one of the hardest-hit states. The event remains an important reminder of the power of nature and the need for preparedness and safety measures.