On September 13, the following notable historical events related to Missouri occurred:

• 1806: The Lewis and Clark Expedition was in the St. Louis area on or around September 13, nearing the conclusion of their exploration of the Louisiana Purchase, with St. Louis serving as their final stop, highlighting Missouri’s role as a key hub.
• 1859: During the prelude to the Civil War, tensions over slavery were high in Missouri. On or around September 13, pro-slavery and abolitionist groups clashed in a minor skirmish in Kansas City, reflecting Missouri’s divided stance in the national debate.
• 1861: During the Civil War, the First Battle of Lexington was ongoing in Missouri. On or around September 13, Confederate forces under Sterling Price tightened their siege on Union troops in Lexington, a critical early conflict in the state.
• 1885: The Missouri Botanical Garden in St. Louis hosted a significant public exhibition around September 13, showcasing rare tropical plants and reinforcing its status as a leading botanical research center.
• 1930: The Kansas City Stockyards set a record for cattle processing around September 13, underscoring Kansas City’s role as a major agricultural hub and boosting Missouri’s economy.
• 1998: The St. Louis Cardinals played a notable game against the Milwaukee Brewers at Busch Stadium on September 13, with Mark McGwire hitting his 66th home run of the season, continuing his record-breaking campaign and cementing Missouri’s baseball legacy.