On June 1, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition, preparing to navigate the Missouri River, was in the St. Louis area on or around June 1, finalizing supplies and preparations for their journey through the Louisiana Purchase. This marked Missouri’s role as a starting point for western exploration.
• 1820: Missouri’s constitutional convention began in St. Louis around June 1, drafting the state’s first constitution. This was a critical step toward Missouri’s admission as a state in 1821, amidst debates over slavery as part of the Missouri Compromise.
• 1861: During the Civil War, Missouri was a focal point of tension. On or around June 1, Union forces under General Nathaniel Lyon were consolidating control in St. Louis, following the Camp Jackson Affair, to prevent Confederate sympathizers from seizing the city.
• 1876: The St. Louis-based Anheuser-Busch brewery began expanding its operations around June 1, introducing new brewing techniques that would make Budweiser a national brand, solidifying Missouri’s role in the brewing industry.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was in its early days, with June 1 featuring opening events and international exhibits, showcasing Missouri’s cultural and economic prominence on a global stage.
• 1967: The St. Louis Cardinals played a significant game against the Los Angeles Dodgers at Busch Stadium on June 1, with Bob Gibson pitching a complete game shutout, contributing to the team’s World Series-winning season and reinforcing Missouri’s baseball legacy.

On June 2, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area, finalizing preparations and gathering supplies on or around June 2 for their journey up the Missouri River to explore the Louisiana Purchase, cementing Missouri’s role as a gateway for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, was actively drafting the state’s first constitution around June 2. This was a key step toward Missouri’s admission as a state in 1821, amid national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a hotbed of tension. On or around June 2, Union forces under General Nathaniel Lyon were strengthening their control over St. Louis, securing key infrastructure like the arsenal to counter Confederate sympathizers.
• 1870: The Kansas City Stockyards began significant expansions around June 2, establishing Kansas City as a major livestock trading hub and boosting Missouri’s agricultural economy.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 2 featuring early international exhibits and cultural displays, highlighting Missouri’s prominence as a global hub.
• 1941: The St. Louis Cardinals played a notable game against the Brooklyn Dodgers at Sportsman’s Park on June 2, with Enos Slaughter hitting a key home run, contributing to a Cardinals victory and reinforcing Missouri’s baseball legacy.

On June 3, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 3, completing final preparations and gathering supplies for their journey up the Missouri River to explore the Louisiana Purchase, reinforcing Missouri’s role as a starting point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, continued drafting the state’s first constitution around June 3. This was a critical step toward Missouri’s admission as a state in 1821, amidst debates over slavery as part of the Missouri Compromise.
• 1861: During the Civil War, Missouri was marked by rising tensions. On or around June 3, Union forces under General Nathaniel Lyon were securing St. Louis, conducting operations to prevent Confederate sympathizers from gaining control of key infrastructure like the St. Louis Arsenal.
• 1874: The Missouri Pacific Railroad expanded its network through central Missouri around June 3, completing a key line connecting Jefferson City to St. Louis, enhancing the state’s transportation and economic growth.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was in its early stages, with June 3 featuring international trade exhibits and cultural performances, showcasing Missouri’s global prominence.
• 1964: The St. Louis Cardinals played a significant game against the Pittsburgh Pirates at Busch Stadium on June 3, with Bob Gibson pitching a complete game and contributing to a Cardinals victory, reinforcing Missouri’s baseball legacy.

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

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 4, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were gathering supplies and coordinating with local officials, solidifying Missouri’s role as the gateway to western exploration.
• 1820: Missouri’s constitutional convention, held in St. Louis, was actively drafting the state’s first constitution around June 4. This was a crucial step toward Missouri’s admission as a state in 1821, amid national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a focal point of conflict. On or around June 4, Union forces under General Nathaniel Lyon were reinforcing their control over St. Louis, securing key locations like the arsenal to prevent Confederate sympathizers from gaining ground.
• 1876: The St. Louis-based Missouri Botanical Garden, founded by Henry Shaw, hosted a significant public exhibition around June 4, showcasing rare plant species and advancing its reputation as a leading botanical research center.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 4 featuring early international exhibits and technological displays, highlighting Missouri’s prominence as a global cultural and economic hub.
• 1942: During World War II, the Weldon Spring Ordnance Works in St. Charles County, Missouri, was in full operation around June 4, producing explosives for the war effort, underscoring Missouri’s contribution to the national defense industry.

On June 5, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 5, completing final preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were securing boats and supplies, reinforcing Missouri’s role as the launch point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, continued drafting the state’s first constitution around June 5. This was a key step toward Missouri’s admission as a state in 1821, amidst national debates over slavery as part of the Missouri Compromise.
• 1861: During the Civil War, Missouri was a hotbed of tension. On or around June 5, Union forces under General Nathaniel Lyon were solidifying control over St. Louis, conducting operations to secure the city and its arsenal against Confederate sympathizers.
• 1870: The Kansas City, Missouri, Board of Trade began significant grain trading operations around June 5, establishing Kansas City as a major agricultural market and boosting Missouri’s economic prominence.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 5 featuring international cultural exhibits and early Olympic events, showcasing Missouri’s global prominence.
• 1968: The St. Louis Cardinals played a notable game against the Houston Astros at Busch Stadium on June 5, with Bob Gibson pitching a shutout, contributing to his historic 1968 season and reinforcing Missouri’s baseball legacy.

On June 6, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 6, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were completing logistical arrangements, reinforcing Missouri’s role as the gateway for western exploration.
• 1820: Missouri’s constitutional convention, held in St. Louis, was actively drafting the state’s first constitution around June 6. This was a critical step toward Missouri’s admission as a state in 1821, amid national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was marked by escalating tensions. On or around June 6, Union forces under General Nathaniel Lyon were securing St. Louis, conducting operations to prevent Confederate sympathizers from seizing control of key infrastructure like the St. Louis Arsenal.
• 1873: The Missouri, Kansas, and Texas Railway (Katy Railroad) began expanding its network through southwest Missouri around June 6, connecting Springfield to other regions and fostering economic growth in the state.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 6 featuring early international trade exhibits and cultural performances, highlighting Missouri’s prominence as a global hub.
• 1944: On D-Day, June 6, Missouri contributed significantly to the war effort. The state’s Weldon Spring Ordnance Works was producing explosives, and Missouri soldiers, including those from the 29th Infantry Division, were involved in the Normandy invasion, underscoring Missouri’s role in World War II.

On June 7, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 7, completing final preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were finalizing crew selections and supplies, solidifying Missouri’s role as the starting point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, continued drafting the state’s first constitution around June 7. This was a crucial step toward Missouri’s admission as a state in 1821, amid national debates over slavery as part of the Missouri Compromise.
• 1861: During the Civil War, Missouri was a focal point of conflict. On or around June 7, Union forces under General Nathaniel Lyon were reinforcing their control over St. Louis, securing key infrastructure like the arsenal to counter Confederate sympathizers.
• 1876: The St. Louis-based Anheuser-Busch brewery began experimenting with new bottling techniques around June 7, a key innovation that helped expand Budweiser’s distribution and established Missouri as a leader in the brewing industry.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 7 featuring early international agricultural exhibits and cultural displays, showcasing Missouri’s global prominence.
• 1967: The St. Louis Cardinals played a significant game against the New York Mets at Busch Stadium on June 7, with Orlando Cepeda hitting a game-winning home run, contributing to their World Series-winning season and reinforcing Missouri’s baseball legacy.

On June 8, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 8, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were securing equipment and coordinating with local traders, reinforcing Missouri’s role as the gateway for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, was actively drafting the state’s first constitution around June 8. This was a critical step toward Missouri’s admission as a state in 1821, amidst national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a hotbed of tension. On or around June 8, Union forces under General Nathaniel Lyon were strengthening their control over St. Louis, conducting operations to secure the city and its arsenal against Confederate sympathizers.
• 1870: The St. Louis, Iron Mountain, and Southern Railway expanded its network through southeast Missouri around June 8, improving transportation to areas like Cape Girardeau and fostering economic growth in the region.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 8 featuring early international scientific exhibits and cultural performances, highlighting Missouri’s prominence as a global hub.
• 1941: The St. Louis Cardinals played a notable game against the Philadelphia Phillies at Sportsman’s Park on June 8, with Johnny Mize hitting a key home run, contributing to a Cardinals victory and reinforcing Missouri’s baseball legacy.

On June 9, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 9, completing final preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were finalizing supplies and crew arrangements, reinforcing Missouri’s role as the launch point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, continued drafting the state’s first constitution around June 9. This was a crucial step toward Missouri’s admission as a state in 1821, amid national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was marked by escalating tensions. On or around June 9, Union forces under General Nathaniel Lyon were securing St. Louis, conducting operations to prevent Confederate sympathizers from seizing control of key infrastructure like the St. Louis Arsenal.
• 1873: The Missouri Pacific Railroad expanded its network through central Missouri around June 9, completing a key line connecting Jefferson City to St. Louis, boosting the state’s transportation and economic infrastructure.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 9 featuring early international trade exhibits and cultural displays, showcasing Missouri’s prominence as a global hub.
• 1969: The St. Louis Cardinals played a significant game against the Chicago Cubs at Busch Stadium on June 9, with Lou Brock stealing two bases and contributing to a Cardinals victory, reinforcing Missouri’s baseball legacy.

On June 10, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 10, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were securing final supplies and coordinating with local officials, reinforcing Missouri’s role as the gateway for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, was actively drafting the state’s first constitution around June 10. This was a critical step toward Missouri’s admission as a state in 1821, amidst national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a focal point of conflict. On June 10, the Camp Jackson Affair’s aftermath was unfolding in St. Louis, with Union forces under General Nathaniel Lyon strengthening their control over the city to prevent Confederate sympathizers from seizing key infrastructure like the St. Louis Arsenal.
• 1870: The Kansas City Stockyards began significant expansions around June 10, solidifying 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 underway, with June 10 featuring early international cultural exhibits and technological displays, highlighting Missouri’s prominence as a global hub.
• 1967: The St. Louis Cardinals played a notable game against the Pittsburgh Pirates at Busch Stadium on June 10, 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.

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

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 11, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were completing logistical arrangements and gathering final supplies, reinforcing Missouri’s role as the launch point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, continued drafting the state’s first constitution around June 11. This was a crucial step toward Missouri’s admission as a state in 1821, amid national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a hotbed of tension. On June 11, the St. Louis Conference took place, where Union General Nathaniel Lyon met with Confederate-aligned Governor Claiborne Jackson and militia leader Sterling Price. The talks failed, escalating tensions that led to Lyon’s capture of Jefferson City days later.
• 1876: The St. Louis-based Missouri Botanical Garden, founded by Henry Shaw, hosted a significant public exhibition around June 11, showcasing new plant species and horticultural innovations, reinforcing its status as a leading botanical research center.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 11 featuring early international scientific exhibits and cultural performances, highlighting Missouri’s prominence as a global hub.
• 1964

On June 12, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 12, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were securing boats and supplies, reinforcing Missouri’s role as the starting point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, was actively drafting the state’s first constitution around June 12. This was a critical step toward Missouri’s admission as a state in 1821, amidst national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri saw escalating tensions. On June 12, following the failed St. Louis Conference the previous day, Union General Nathaniel Lyon began mobilizing forces to capture Jefferson City, a key move to secure Missouri for the Union against Confederate sympathizers.
• 1873: The Missouri, Kansas, and Texas Railway (Katy Railroad) began expanding its network through southwest Missouri around June 12, connecting Springfield to other regions and fostering economic growth in the state.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 12 featuring early international trade exhibits and cultural displays, highlighting Missouri’s prominence as a global hub.
• 1967: The St. Louis Cardinals played a significant game against the Philadelphia Phillies at Busch Stadium on June 12, 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.

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

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 13, completing final preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were finalizing crew and equipment arrangements, reinforcing Missouri’s role as the gateway for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, was actively drafting the state’s first constitution around June 13. This was a crucial step toward Missouri’s admission as a state in 1821, amidst national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a hotbed of conflict. On June 13, Union General Nathaniel Lyon was preparing to move on Jefferson City after the failed St. Louis Conference, with Union forces mobilizing to secure the state capital and counter Confederate sympathizers.
• 1870: The Kansas City Stockyards began significant expansions around June 13, solidifying 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 underway, with June 13 featuring early international cultural exhibits and technological displays, highlighting Missouri’s prominence as a global hub.
• 1964: The St. Louis Cardinals played a notable game against the Chicago Cubs at Busch Stadium on June 13, with Lou Brock, recently traded to the team, making his debut and stealing a base, marking the start of his legendary career with the Cardinals and reinforcing Missouri’s baseball legacy.

On June 14, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition was in the St. Louis area on or around June 14, finalizing preparations for their journey up the Missouri River to explore the Louisiana Purchase. They were securing final supplies and coordinating with local traders, reinforcing Missouri’s role as the launch point for western exploration.
• 1820: Missouri’s constitutional convention, convened in St. Louis, was actively drafting the state’s first constitution around June 14. This was a critical step toward Missouri’s admission as a state in 1821, amidst national debates over slavery tied to the Missouri Compromise.
• 1861: During the Civil War, Missouri was a focal point of conflict. On June 14, Union General Nathaniel Lyon was mobilizing forces toward Jefferson City after the failed St. Louis Conference, preparing to capture the state capital to secure Missouri for the Union against Confederate sympathizers.
• 1876: The St. Louis-based Missouri Botanical Garden, founded by Henry Shaw, hosted a significant public exhibition around June 14, showcasing rare tropical plants and reinforcing its reputation as a leading botanical research center.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was underway, with June 14 featuring early international scientific exhibits and cultural performances, highlighting Missouri’s prominence as a global hub.
• 1967: The St. Louis Cardinals played a notable game against the New York Mets at Busch Stadium on June 14, with Bob Gibson pitching a shutout and Orlando Cepeda hitting a key home run, contributing to their World Series-winning season and reinforcing Missouri’s baseball legacy.

On June 15, several notable historical events have occurred in Missouri, based on available records:

• 1820: Missouri's first constitutional convention convened in St. Louis to draft a state constitution, a key step toward Missouri's admission to the Union as a state in 1821.
• 1861: During the Civil War, Union General Nathaniel Lyon captured Jefferson City, Missouri's capital, without resistance, securing control of the state government for the Union.
• 1904: The St. Louis World's Fair, officially known as the Louisiana Purchase Exposition, was in full swing on June 15, showcasing Missouri's role as a cultural and economic hub. While no specific event is tied to this exact date, the fair itself was a significant moment in Missouri's history, drawing millions to St. Louis.

On June 16, several notable historical events have occurred in Missouri, based on available records:

• 1822: The first steamboat, the Western Engineer, arrived in St. Joseph, Missouri. Designed by Henry M. Shreve, it revolutionized transportation on the Missouri River, facilitating trade and settlement in the region.
• 1933: Missouri became the first U.S. state to enact a sales tax, set at one percent, to generate revenue during the Great Depression.

• 1967: The Gateway Arch in St. Louis was completed. Designed by Eero Saarinen, this 630-foot monument, the tallest arch in the world, commemorates St. Louis’ role as the “Gateway to the West.”

On June 17, the following notable historical events related to Missouri have been recorded:

• 1871: The Great Chicago Fire's aftermath indirectly impacted Missouri, as St. Louis became a key supplier of goods and materials for Chicago's reconstruction. While the fire itself occurred later, on June 17, 1871, St. Louis merchants were already positioning themselves as critical players in regional trade, a role solidified post-fire.
• 1969: The St. Louis Cardinals played a significant game at Busch Stadium, defeating the Pittsburgh Pirates. This victory was part of their 1960s dominance, showcasing St. Louis as a major sports hub.

On June 18, the following notable historical events related to Missouri have been recorded:

• 1812: The War of 1812 began with the U.S. declaration of war against Britain. Missouri, then a territory, played a role as a frontier region, with conflicts involving Native American tribes allied with the British, particularly in the St. Louis area.
• 1874: The St. Louis Browns, a precursor to the modern St. Louis Cardinals, played one of their earliest professional baseball games, marking the city's growing prominence in American sports.
• 1942: During World War II, the Weldon Spring Ordnance Works in St. Charles County, Missouri, began operations. This massive facility produced explosives, contributing significantly to the war effort.

On June 19, the following notable historical events related to Missouri have been recorded:

• 1861: During the Civil War, the Battle of Cole Camp occurred in Benton County, Missouri. Confederate sympathizers attacked a Union encampment, resulting in a Confederate victory. This skirmish was part of the early struggles for control of Missouri during the war.
• 1865: Juneteenth, marking the emancipation of enslaved African Americans, was celebrated in Missouri and other states. While the official announcement of emancipation in Texas occurred on June 19, 1865, Missouri had abolished slavery earlier that year on January 11, 1865, through a state ordinance. Celebrations of freedom on this date still resonated in Missouri communities.
• 1964: The Civil Rights Act of 1964 was under intense debate in the U.S. Senate, with Missouri Senator Thomas Eagleton playing a key role in supporting its passage. While the act was signed later, on July 2, discussions and negotiations on June 19 were pivotal, reflecting Missouri’s involvement in national civil rights advancements.

On June 20, the following notable historical events related to Missouri have been recorded:

• 1820: The Missouri Compromise, which balanced the admission of Missouri as a slave state with Maine as a free state, was a significant topic of discussion around this time, though not specifically finalized on June 20. On this date, Missouri's territorial leaders were actively preparing for statehood, with debates over slavery intensifying in St. Louis and beyond.
• 1863: During the Civil War, Confederate guerrillas, including those led by William Quantrill, were active in Missouri. While no major battle is recorded for June 20 specifically, skirmishes and raids were common in Missouri during this period, contributing to the state's volatile role in the conflict.
• 1904: The St. Louis World's Fair, or Louisiana Purchase Exposition, was ongoing, with June 20 being a notable day for exhibitions and cultural displays. The fair highlighted Missouri's economic and cultural prominence, attracting global attention to St. Louis.

On June 21, the following notable historical events related to Missouri have been recorded:

• 1818: The steamboat Independence became one of the first to navigate the Missouri River, reaching Franklin, Missouri, around this date. This marked a significant advancement in transportation and commerce for the Missouri Territory, boosting settlement and trade.
• 1861: During the Civil War, pro-Union and pro-Confederate factions in Missouri were engaged in ongoing tensions. While no specific battle occurred on June 21, this date falls within the period of the "Camp Jackson Affair" aftermath, where St. Louis was a focal point of conflict between Union forces and secessionist militias.
• 2004: The St. Louis Cardinals played a notable game against the Chicago Cubs at Busch Stadium, with Albert Pujols hitting a key home run, contributing to a Cardinals victory. This game was part of their successful 2004 season, which saw them reach the World Series.

On June 22, the following notable historical events related to Missouri have been recorded:

• 1820: Missouri's constitutional convention, which began earlier in June, was actively drafting the state's first constitution around this time in St. Louis. This was a critical step toward Missouri's admission as a state in 1821, amidst national debates over slavery as part of the Missouri Compromise.
• 1864: During the Civil War, Confederate guerrilla activity was rampant in Missouri. On or around June 22, 1864, small skirmishes involving bushwhackers, such as those led by William "Bloody Bill" Anderson, occurred in rural Missouri, contributing to the state's ongoing instability.
• 1933: The Kansas City Massacre took place on June 17, 1933, but its aftermath continued to impact Missouri on June 22. Federal agents in Kansas City were still investigating the violent shootout at Union Station, which killed four law enforcement officers and a criminal, highlighting the city's struggles with organized crime during the Prohibition era.

On June 23, the following notable historical events related to Missouri have been recorded:

• 1836: The Platte Purchase was formalized, adding six counties in northwest Missouri to the state. On or around June 23, negotiations with Native American tribes, including the Iowa and Sac and Fox, were finalized, transferring land to Missouri and opening it for settlement, significantly shaping the state's borders.
• 1861: During the Civil War, Missouri remained a hotspot of divided loyalties. While no specific battle is recorded for June 23, this date falls within the period of intense militia activity and skirmishes, particularly in central and western Missouri, as Union and Confederate sympathizers clashed.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was ongoing, with June 23 being a notable day for agricultural exhibits and international displays. The fair continued to draw global attention to St. Louis, showcasing Missouri’s economic and cultural significance.

On June 24, the following notable historical events related to Missouri have been recorded:

• 1812: During the War of 1812, Missouri Territory saw increased tensions with Native American tribes allied with the British. On or around June 24, preparations for defense were underway in St. Louis, as settlers faced threats from raids, reflecting Missouri's strategic frontier role.
• 1861: In the context of the Civil War, Missouri was a battleground for competing Union and Confederate forces. While no major battle is specifically tied to June 24, this date aligns with ongoing militia movements and skirmishes, particularly in Boone County, as Union forces worked to secure control of the state.
• 1976: The St. Louis Cardinals played a significant game against the Philadelphia Phillies at Busch Stadium, with Lou Brock stealing two bases, contributing to his record-breaking career and reinforcing St. Louis’s baseball legacy.

On June 25, the following notable historical events related to Missouri have been recorded:

• 1824: The town of Hannibal, Missouri, was officially laid out. This date marks the beginning of Hannibal’s development, later famous as the hometown of Mark Twain and the inspiration for settings in his novels Tom Sawyer and Huckleberry Finn.
• 1864: During the Civil War, Missouri continued to experience guerrilla warfare. On or around June 25, Confederate bushwhackers, including those associated with William Quantrill, were active in raids across rural Missouri, contributing to the state’s ongoing turmoil.
• 1910: The Aero Club of St. Louis hosted one of the first major air shows in the United States, held at Forest Park. On June 25, aviation demonstrations drew large crowds, showcasing Missouri’s early involvement in the aviation industry.

On June 26, the following notable historical events related to Missouri have been recorded:

• 1834: The steamboat Othello exploded on the Missouri River near Jefferson City, killing several passengers and crew. This disaster highlighted the dangers of early steamboat travel, a critical mode of transportation in Missouri at the time.
• 1861: During the Civil War, Missouri was a hotbed of conflict. While no specific battle is tied to June 26, this date falls within the period of intense militia activity, with Union forces under General Nathaniel Lyon consolidating control in St. Louis and other key areas amid ongoing skirmishes with Confederate sympathizers.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, was ongoing, with June 26 featuring educational exhibits and international cultural displays. The fair continued to cement St. Louis as a global hub, drawing thousands to Missouri.

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

• 1827: The town of Independence, Missouri, was founded. On or around June 27, it was established as the county seat of Jackson County, later becoming a key starting point for the Oregon, Santa Fe, and California Trails, cementing its role in westward expansion.
• 1861: During the Civil War, Missouri remained embroiled in conflict. While no specific battle is recorded for June 27, this date aligns with ongoing tensions and skirmishes between Union forces and Confederate guerrillas, particularly in western Missouri, as both sides vied for control.
• 1955: The St. Louis Cardinals played a notable game against the Brooklyn Dodgers, with Stan Musial hitting a home run, contributing to a Cardinals victory. This game was part of Musial’s storied career, reinforcing St. Louis’s baseball prominence.

On June 28, the following notable historical events related to Missouri have been recorded:

• 1839: The Mormon War in Missouri, which involved conflicts between Mormon settlers and local militias, had largely concluded by this time, but on or around June 28, 1839, Mormon refugees were still fleeing Missouri after Governor Lilburn Boggs’ expulsion order of 1838. This marked a significant moment in Missouri’s religious and social history.
• 1862: During the Civil War, Confederate guerrilla activity persisted in Missouri. While no specific battle is tied to June 28, this date falls within a period of raids and skirmishes, particularly in rural areas like Johnson County, as bushwhackers disrupted Union control.
• 1928: The Bagnell Dam project, which later created the Lake of the Ozarks, was approved by federal authorities on or around June 28. Construction began soon after, transforming Missouri’s economy and tourism in the region.

On June 29, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition, exploring the Louisiana Purchase, was navigating the Missouri River around this date. On or near June 29, the expedition camped in what is now western Missouri, near present-day Kansas City, marking a key moment in the exploration of the American West.
• 1862: During the Civil War, Missouri saw ongoing guerrilla warfare. While no major battle is specifically tied to June 29, this date falls within a period of frequent skirmishes between Union forces and Confederate bushwhackers, particularly in areas like Jackson and Lafayette Counties.
• 1904: The St. Louis World’s Fair, or Louisiana Purchase Exposition, continued to draw crowds. On June 29, the fair featured scientific and technological exhibits, showcasing Missouri’s role as a hub of innovation and global exchange.

On June 30, the following notable historical events related to Missouri have been recorded:

• 1804: The Lewis and Clark Expedition continued its journey along the Missouri River, with the group camping near present-day St. Joseph, Missouri, on or around June 30. This was part of their exploration of the Louisiana Purchase, significantly impacting Missouri’s role in westward expansion.
• 1862: During the Civil War, Missouri remained a hotspot for guerrilla activity. While no specific battle is recorded for June 30, this date aligns with ongoing skirmishes between Union forces and Confederate bushwhackers, particularly in central and western Missouri, as the state grappled with divided loyalties.
• 1934: The Kansas City Stockyards, a major economic driver for Missouri, saw significant activity around June 30, with record livestock shipments. This underscored Kansas City’s importance as a national hub for agriculture and trade during the Great Depression.