1. On April 9, 1864, during the Civil War, Union troops under General Nathaniel Banks began their advance on Shreveport. The campaign would ultimately prove unsuccessful, with the Confederates successfully defending their stronghold.

2. The Louisiana Purchase Exposition, also known as the St. Louis World's Fair, opened on April 9, 1904. Louisiana was heavily involved in the exposition, with a large state exhibit showcasing the state's industries, agriculture, and culture.

3. On April 9, 1943, the German submarine U-758 attacked and sank the American freighter SS West Lashaway off the coast of Louisiana. The attack was part of a larger campaign by German U-boats to disrupt trade along the Gulf of Mexico.

4. In 1988, on April 9, a collision occurred between an Amtrak train and a truck carrying hydrochloric acid in Livingston, Louisiana. The accident resulted in the release of toxic gas, the evacuation of nearby residents, and the hospitalization of dozens of people.

5. On April 9, 2018, a severe thunderstorm swept through Louisiana, producing strong winds and tornadoes. The storms caused widespread damage, including the destruction of several homes and buildings.