1. Louisiana became the 18th state in the United States on May 28, 1812. Louisiana was once a French colony and was later sold to the United States in 1803 as part of the Louisiana Purchase.

2. On May 28, 1861, the Louisiana State Convention passed an ordinance of secession, joining 10 other southern states in seceding from the United States and forming the Confederate States of America.

3. In 1954, the U.S. Supreme Court handed down its landmark decision in Brown v. Board of Education on May 28, which declared that segregation in public schools was unconstitutional. This ruling ultimately led to the desegregation of schools in Louisiana and throughout the nation.

4. May 28 is also known as National Hamburger Day, and Louisiana is known for some unique takes on this classic dish. For example, some restaurants in New Orleans serve "Fleur de Lis" burgers, which are topped with a crawfish cream sauce.

5. The Louisiana Cajun-Zydeco Festival, an annual celebration of Cajun and Zydeco music and culture, is typically held in New Orleans during the last weekend of May, and may fall on May 28. The festival features live music, food, and crafts, and attracts visitors from around the world.