1. Louisiana became a state: August 15, 1812, was a significant day in Louisiana's history as it became the 18th state of the United States. Louisiana's unique culture, influenced by French, Spanish, and African traditions, has played an essential role in shaping the state's identity.

2. The Battle of New Orleans: The Battle of New Orleans took place on January 8, 1815, but it was in August 1814 that the British army arrived in the Gulf of Mexico, marking the start of the conflict. The victory of American forces, under the leadership of Andrew Jackson, against a superior British army, was a decisive moment in US history and secured the nation's place as a world power.

3. Hurricane Katrina: In 2005, on August 15, Hurricane Katrina formed and began to gain strength over the next few days. By August 28, the hurricane reached Category 5 intensity, devastating the Gulf Coast and causing massive flooding in New Orleans. The disaster led to a widespread evacuation, displacement, and loss of life, making it one of the worst natural disasters in American history.

4. Louisiana Purchase: The Louisiana Purchase was not formally signed until December 20, 1803, but the original treaty was agreed upon three months earlier, on August 15, after months of negotiations. The acquisition of the Louisiana Territory, which doubled the size of the United States, was a significant moment in American history.

5. Governor Huey Long: On August 15, 1935, Louisiana Governor Huey Long was shot and fatally wounded in the state Capitol building in Baton Rouge. Long was a controversial figure, known for his populist policies and political maneuvering. His death shook the state and led to changes in Louisiana's political landscape.