1. Louisiana became a state on March 21, 1803 - this date marks the official admission of Louisiana as the 18th state of the United States. The Louisiana Purchase, which had been signed by President Thomas Jefferson in 1803, had paved the way for this historic event.

2. The Battle of Fort Bisland began on March 21, 1863 - this was a significant battle in the American Civil War. Union forces under General Nathaniel Banks attempted to capture the fortification, but were ultimately repelled by Confederate troops commanded by General Richard Taylor.

3. The New Orleans Pelicans baseball team played their first game on March 21, 1887 - the Pelicans were formed as part of the Southern League, and played their first game against the Memphis Reds. The team would go on to become one of the most successful minor league franchises in history.

4. Huey P. Long was born on March 21, 1893 - Long was a controversial figure in Louisiana politics, serving as governor from 1928 to 1932 and then as a U.S. senator until his assassination in 1935. Long is known for his populist views and ambitious political agenda, which included extensive public works programs and social reforms.

5. The Battle of Mansura took place on March 21, 1864 - this battle was one of the final engagements of the Red River Campaign, which was an unsuccessful Union attempt to capture strategic points in Louisiana. Confederate troops commanded by General Richard Taylor were able to repel the Union forces under General A.J. Smith and effectively end the campaign.