1. The Louisiana Purchase was ratified on March 3, 1803: This historic document, which effectively doubled the size of the United States, was ratified by the U.S. Senate on March 3, 1803, after being signed by President Thomas Jefferson on February 17 of the same year.

2. Louisiana became a U.S. state on March 3, 1812: After more than a decade of operating as a U.S. territory, Louisiana was granted statehood on March 3, 1812, becoming the 18th state to join the union.

3. The Battle of Henderson's Hill took place on March 3, 1864: This Civil War battle, which was fought near the town of Mansfield, Louisiana, was a significant victory for Confederate forces in the area.

4. Huey Long declared martial law on March 3, 1935: In response to a political crisis in which the Louisiana state legislature was deadlocked, Governor Huey Long declared martial law, assuming control of the state government until the crisis was resolved.

5. The Louisiana Hayride radio show premiered on March 3, 1948: This radio show, which was broadcast from the Municipal Auditorium in Shreveport, Louisiana, helped launch the careers of numerous country music stars, including Hank Williams, Elvis Presley, and Johnny Cash.