1. On June 15, 1836, Mississippi became the 20th state in the United States. The state, located in the southern United States, was originally inhabited by various indigenous peoples before European exploration and colonization.

2. On June 15, 1964, James Chaney, Andrew Goodman, and Michael Schwerner, three civil rights workers, were murdered by members of the Ku Klux Klan in Neshoba County, Mississippi. The crime drew national attention and led to the eventual convictions of several Klan members.

3. On June 15, 1917, the first ship loaded with American soldiers left Gulfport, Mississippi, bound for Europe during World War I. The ship was part of a larger effort by the United States government to provide troops and resources to the Allied forces in Europe.

4. On June 15, 1877, the Mississippi River flooded and caused widespread destruction throughout the state. The flood was part of a larger series of floods that affected the Midwest and South that year, resulting in significant economic damage and loss of life.

5. On June 15, 1947, Mississippi State University became the first college in the United States to field a team of live bulldogs as mascots. The tradition continues to this day, with the current bulldog team being known as "Bully XXI".