1. In 1718, the city of New Orleans was founded by Jean-Baptiste Le Moyne de Bienville, making May 7th an important date in Louisiana history. New Orleans played a significant role in the state's history, serving as a major trade hub, and becoming known for its vibrant culture and unique cuisine.

2. On May 7, 1861, the Louisiana state legislature passed an ordinance of secession, officially declaring the state's withdrawal from the United States. This action was part of the larger secession movement that led to the American Civil War.

3. The Louisiana Purchase Exposition, also known as the St. Louis World's Fair, officially opened on May 7, 1904. Louisiana was well represented at the fair, which showcased the state's natural resources, industries, and cultural heritage.

4. In 1939, jazz legend Louis Armstrong recorded his hit song "When the Saints Go Marching In" with his band, the Louis Armstrong All-Stars. The song has become an unofficial anthem for the city of New Orleans and has been covered by countless artists over the years.

5. On May 7, 1995, a major flood devastated parts of Louisiana, causing widespread damage and displacing thousands of residents. The flood was caused by heavy rainfall and inadequate infrastructure, and led to significant changes in the way that the state manages its water resources.