On August 13, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was near present-day Omaha, Nebraska, across from Missouri’s Atchison County, on or around August 13. They continued documenting the region’s geography and interactions with Native American tribes, advancing their exploration of the Louisiana Purchase.
• 1838: During the Mormon War in Missouri, tensions remained high. On or around August 13, non-Mormon vigilantes in Daviess and Carroll Counties continued 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, the aftermath of the Battle of Wilson’s Creek (August 10) was ongoing in Missouri. On August 13, Union forces, having retreated from Springfield, were regrouping, while Confederate forces consolidated their control in southwest Missouri, underscoring the state’s volatile role in the conflict.
• 1873: The Missouri Pacific Railroad expanded its network through central Missouri around August 13, completing a key line connecting Jefferson City to other regions, boosting the state’s transportation and economic infrastructure.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was ongoing, with August 13 featuring international trade exhibits and cultural performances, reinforcing Missouri’s prominence as a global hub.
• 1967: The St. Louis Cardinals played a notable game against the Pittsburgh Pirates at Busch Stadium on August 13, with Bob Gibson pitching a complete game and Roger Maris hitting a key home run, contributing to their World Series-winning season and reinforcing Missouri’s baseball legacy.