On July 27, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition, navigating the Missouri River, was near present-day Otoe County, Nebraska, across from Missouri’s Atchison County, on or around July 27. They continued their council with Otoe and Missouri tribes, documenting the region’s resources and cultural exchanges, advancing their exploration of the Louisiana Purchase.
• 1838: During the Mormon War in Missouri, tensions escalated significantly. On or around July 27, non-Mormon vigilantes in Daviess County intensified their campaign against Mormon settlers, with skirmishes and threats escalating the conflict that led to the Mormon expulsion order later in 1838.
• 1861: During the Civil War, Missouri remained a hotbed of conflict. On July 27, Union forces under General Nathaniel Lyon were engaged in minor skirmishes in southwest Missouri near Springfield, part of their strategic maneuvers leading up to the Battle of Wilson’s Creek.
• 1873: The Missouri Pacific Railroad expanded its network through central Missouri around July 27, completing a key line connecting Jefferson City to St. Louis, boosting the state’s economic and transportation infrastructure.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was ongoing, with July 27 featuring international agricultural exhibits and cultural performances, reinforcing Missouri’s prominence as a global hub.
• 1922: The Bagnell Dam, which created the Lake of the Ozarks, began early construction planning around July 27, marking a significant step toward transforming Missouri’s tourism and energy sectors.