1. Louisiana becomes a U.S. territory: On July 28, 1803, Louisiana became a U.S. territory after the Louisiana Purchase from France. The purchase doubled the size of the United States and opened up a vast territory for exploration and settlement.

2. Battle of Fort Bisland: On July 28, 1863, Confederate troops under General Richard Taylor attacked Union forces at Fort Bisland on Bayou Teche. The battle was part of the Civil War's Western Theater and ended with a Confederate victory.

3. The New Orleans Picayune is founded: On July 28, 1837, the New Orleans Picayune newspaper was founded. Over the years, it became one of the most influential newspapers in the country and helped shape public opinion on the issues of the day.

4. Huey P. Long is born: On July 28, 1893, future Louisiana governor Huey P. Long was born in Winnfield. Long was a controversial figure known for his populist policies and flamboyant personality.

5. Hurricane Audrey strikes: On July 28, 1957, Hurricane Audrey struck the Louisiana coast, causing widespread devastation and loss of life. The storm was one of the deadliest of the 20th century and prompted improvements in hurricane forecasting and preparedness.