1) On June 1, 1861, Missouri was engulfed in the Civil War when Union forces constructed Camp Jackson in St. Louis to train troops for a potential Confederate invasion. This spurred unrest among pro-Confederate Missourians, culminating in the Camp Jackson Massacre in which Union soldiers killed 28 civilians.

2) June 1, 1904 marked the official opening of the St. Louis World's Fair, also known as the Louisiana Purchase Exposition. This event drew millions of visitors from around the world and showcased new technology and cultural exhibits.

3) On June 1, 1943, over 200 African American soldiers stationed at Fort Leonard Wood in south-central Missouri staged a sit-down strike to protest segregation and mistreatment in the army. This marked an early example of African American soldiers challenging racial discrimination within the military.

4) June 1, 1985 saw a tragic tornado outbreak in parts of Missouri, including the towns of Sarcoxie and Springfield. 39 people were killed and over 300 were injured in the storms, which caused widespread damage.

5) In more recent history, June 1, 2018 marked the beginning of Pride Month celebrations in Missouri and around the world. This month recognizes and celebrates the LGBTQ+ community and their contributions to society. Many cities in Missouri hold parades, festivals, and other events throughout the month.