1. In 1961, the New Orleans Saints were officially granted an NFL franchise on September 19th. The team played their first game on September 17, 1967.

2. On September 19, 1804, Captain William Clark and Meriwether Lewis held a meeting with the Osage tribe of Native Americans to negotiate the safe passage of their expedition up the Missouri River.

3. The Battle of Bayou Fordoche, also known as the Battle of Sterling's Plantation, occurred on September 19, 1863, during the American Civil War. Confederate forces were defeated by Union forces, which helped to secure the Mississippi River as a Union supply line.

4. On September 19, 1901, S. W. K. Dorsey launched the first successful oil well in Louisiana in Jennings, Louisiana. This discovery led to the development of the state's oil industry, which remains a significant part of Louisiana's economy today.

5. In 1957, Governor Earl K. Long signed the Louisiana Civil Rights Act, which outlawed discrimination based on race, religion, or national origin in public accommodations, education, employment, and housing. This law was a precursor to the more comprehensive federal Civil Rights Act of 1964.