On July 11, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition, traveling along the Missouri River, was near present-day Atchison County, Missouri, on or around July 11. The explorers noted the river’s strong currents and interactions with local Native American tribes, contributing to their mapping of the Louisiana Purchase.
• 1838: During the Mormon War in Missouri, tensions escalated. On or around July 11, conflicts between Mormon settlers and non-Mormon residents in Carroll County intensified, with skirmishes and petitions against Mormons, foreshadowing the violent expulsion of Mormons from Missouri later that year.
• 1861: During the Civil War, Missouri saw continued military activity. On July 11, Union forces under General Nathaniel Lyon clashed with Confederate sympathizers in small skirmishes near Springfield, as both sides maneuvered in preparation for the Battle of Wilson’s Creek.
• 1857: The St. Louis Agricultural and Mechanical Fair, one of the largest of its kind in the Midwest, was being organized around July 11, with preparations for its annual event showcasing Missouri’s agricultural innovations and economic growth.
• 1941: The St. Louis Cardinals played a significant game against the Chicago Cubs at Sportsman’s Park, with Enos Slaughter hitting a crucial home run, contributing to a Cardinals victory and reinforcing St. Louis’s baseball prominence.