1. Louisiana became a state on March 7, 1812. The Louisiana Purchase, in which the United States acquired the territory from France in 1803, paved the way for statehood. The first state capital was New Orleans.

2. On March 7, 1964, the first Mardi Gras parade was held in Lake Charles, Louisiana. Mardi Gras is a popular festival in the state, celebrated annually in many cities and towns, culminating in a huge parade on the day before Ash Wednesday.

3. The Louisiana Superdome, one of the largest domed stadiums in the world, officially opened on March 7, 1975. Located in New Orleans, the Superdome has hosted numerous major sporting events and concerts.

4. Louisiana State University was established on March 7, 1860. The university is now one of the largest in the state, with campuses in Baton Rouge, Alexandria, Eunice, and Shreveport.

5. St. Patrick's Day is celebrated annually on March 7 in the city of Baton Rouge, Louisiana. The celebration features a parade, live music, and lots of green beer.