1. In 1836, Arkansas Governor James S. Conway signed an act that established Barry County in Missouri. The county was named after William Taylor Barry, a politician from Kentucky who served as Postmaster General under President Andrew Jackson.

2. On June 15, 1846, Missouri Governor John C. Edwards signed a bill that established the Missouri State Normal School, which later became known as Southeast Missouri State University. The school was originally located in Pineville, Missouri, but was moved to Cape Girardeau in 1873.

3. In 1904, the first Missouri State Fair was held in Sedalia, Missouri. The fair was established to promote Missouri agriculture and to encourage farmers to improve the quality of their crops and livestock.

4. On June 15, 1960, a tornado swept through the town of Mountainburg, Missouri, killing six people and injuring many others. The tornado was part of a larger outbreak that affected several states in the Midwest and the South.

5. In 2019, Missouri Governor Mike Parson declared June 15 as "Vietnam Veterans Recognition Day" in Missouri. The day was established to honor the service and sacrifice of Missouri veterans who served in the Vietnam War.