1. Louisiana's first radio station went on air on May 4, 1922. Station WWL, in New Orleans, began broadcasting news, weather reports, and music to residents of the city.

2. In 1970, the Kent State Shootings in Ohio led to protests across the country, including in Louisiana. On May 4 of that year, students at Louisiana State University held a silent march in honor of the victims.

3. May 4, 1984, marked the opening of the Louisiana World Exposition, a world's fair held in New Orleans. The event brought in over 7 million visitors and generated over $1 billion in economic activity.

4. On May 4, 1995, a levee broke in Plaquemine Parish, leading to severe flooding in the area. The disaster prompted improvements in the state's flood control systems.

5. In 2019, Louisiana Governor John Bel Edwards signed a bill into law on May 4 that raised the state's minimum age for marriage to 16 years old. Prior to the law, Louisiana had the lowest minimum age for marriage in the country, at 14 with parental consent.