1. Hurricane Rita made landfall in Louisiana on September 21, 2005, as a category 3 storm. It remains one of the most devastating hurricanes to hit the state, causing widespread flooding and destruction.

2. The Louisiana Purchase Treaty was signed on September 21, 1803, in Paris, France, by representatives of the United States and France. The treaty added over 800,000 square miles of land to the United States, including much of what is now Louisiana.

3. The Battle of Baton Rouge took place on September 21, 1862, during the American Civil War. Union forces under the command of Major General Nathaniel P. Banks seized control of the city from Confederate forces, marking a significant victory for the Union.

4. The Louisiana State Capitol building was dedicated on September 21, 1932. At the time of its completion, it was the tallest capitol building in the United States and remains an iconic landmark in Baton Rouge.

5. Louisiana native and baseball legend Mel Ott was born on September 21, 1909. Ott played for the New York Giants for 22 seasons and was inducted into the Baseball Hall of Fame in 1951. He remains one of the greatest players in the history of the sport.