1. In 1803, the Louisiana Purchase Treaty was signed in Washington D.C, marking the purchase of the Louisiana Territory from France for $15 million.

2. On February 18, 1861, the Confederate States of America officially adopted the "Stars and Bars" flag as their national flag, which would later be replaced by the better-known "Battle Flag" during the Civil War.

3. In 1927, the Great Mississippi Flood began as heavy rains caused the Mississippi River to break its levees and flood towns and cities throughout Louisiana, Mississippi, and Arkansas. Over 500 people died, and the damage was estimated at $1 billion.

4. On February 18, 1952, Mardi Gras was celebrated in New Orleans for the first time since World War II, as the city lifted the ban on large crowds due to fears of another attack or sabotage.

5. In 2006, the New Orleans Saints won their first Super Bowl in franchise history, defeating the Indianapolis Colts 31-17. The game was played in Miami, but the victory was celebrated wildly throughout Louisiana, with parades and parties lasting for days.