On June 5, 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 5, completing final preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were securing boats and supplies, reinforcing Missouri’s role as the launch point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, continued drafting the state’s first constitution around June 5. This was a key step toward Missouri’s admission as a state in 1821, amidst national debates over slavery as part of the Missouri Compromise.
• 1861: During the Civil War, Missouri was a hotbed of tension. On or around June 5, Union forces under General Nathaniel Lyon were solidifying control over St. Louis, conducting operations to secure the city and its arsenal against Confederate sympathizers.
• 1870: The Kansas City, Missouri, Board of Trade began significant grain trading operations around June 5, establishing Kansas City as a major agricultural market and boosting Missouri’s economic prominence.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 5 featuring international cultural exhibits and early Olympic events, showcasing Missouri’s global prominence.
• 1968: The St. Louis Cardinals played a notable game against the Houston Astros at Busch Stadium on June 5, with Bob Gibson pitching a shutout, contributing to his historic 1968 season and reinforcing Missouri’s baseball legacy.