On June 8, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 8, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were securing equipment and coordinating with local traders, reinforcing Missouri’s role as the gateway for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, was actively drafting the state’s first constitution around June 8. This was a critical step toward Missouri’s admission as a state in 1821, amidst national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a hotbed of tension. On or around June 8, Union forces under General Nathaniel Lyon were strengthening their control over St. Louis, conducting operations to secure the city and its arsenal against Confederate sympathizers.
• 1870: The St. Louis, Iron Mountain, and Southern Railway expanded its network through southeast Missouri around June 8, improving transportation to areas like Cape Girardeau and fostering economic growth in the region.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 8 featuring early international scientific exhibits and cultural performances, highlighting Missouri’s prominence as a global hub.
• 1941: The St. Louis Cardinals played a notable game against the Philadelphia Phillies at Sportsman’s Park on June 8, with Johnny Mize hitting a key home run, contributing to a Cardinals victory and reinforcing Missouri’s baseball legacy.