1. In 1877, the Battle of Water Valley took place near Bernice, Louisiana, during the Reconstruction Era. This was a conflict between white Democrats and black Republicans over control of the local government.

2. On June 21, 1937, Louisiana Governor Richard Leche signed the "Louisiana Hayride" bill into law. The law created a program to promote country music in the state and paved the way for the famous radio show of the same name.

3. In 1964, civil rights activist James Chaney was arrested in Louisiana on trumped-up charges while working to register African American voters. Chaney was later murdered along with two other activists in Mississippi, an event that became known as the "Freedom Summer" murders.

4. On June 21, 1982, Louisiana Governor Dave Treen signed a bill officially designating the Louisiana Catahoula Leopard Dog as the state dog. This breed is known for its hunting and herding abilities.

5. In 2010, the Deepwater Horizon oil spill disaster in the Gulf of Mexico continued to affect Louisiana's environment and economy. On June 21 of that year, the federal government announced that BP had placed a cap on the leaking oil well, marking a small step towards containing the damage.