On September 4, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was near present-day Yankton, South Dakota, across from Missouri’s Atchison County, on or around September 4. They continued documenting the region’s resources and interactions with the Yankton Sioux, advancing their exploration of the Louisiana Purchase.
• 1838: During the Mormon War in Missouri, tensions remained high. On or around September 4, non-Mormon vigilantes in Daviess and Carroll Counties continued their campaign against Mormon settlers, with skirmishes escalating the conflict that led to the Mormon expulsion order later in 1838.
• 1861: During the Civil War, Missouri was a hotbed of conflict. On September 4, Confederate forces under Sterling Price were advancing toward Lexington, Missouri, while Union forces were fortifying their defenses, setting the stage for the First Battle of Lexington later that month.
• 1870: The Kansas City Stockyards expanded operations around September 4, reinforcing Kansas City’s role as a major livestock trading hub and boosting Missouri’s agricultural economy.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was ongoing, with September 4 featuring international cultural exhibits and athletic competitions, including Olympic events, highlighting Missouri’s global prominence.
• 1967: The St. Louis Cardinals played a notable game against the Chicago Cubs at Busch Stadium on September 4, with Bob Gibson pitching a complete game and Orlando Cepeda hitting a key home run, contributing to their World Series-winning season and reinforcing Missouri’s baseball legacy.