1. Louisiana Purchase: December 3, 1803 marks the official transfer of Louisiana from France to the United States, which became known as the Louisiana Purchase. This historic event doubled the size of the country and allowed for westward expansion.

2. William C. C. Claiborne: On December 3, 1812, William C. C. Claiborne became the first governor of Louisiana after it was admitted as a state. Claiborne played an instrumental role in shaping the state's early history.

3. Jazz legend: Jazz legend Alvin Batiste was born on December 3, 1932, in New Orleans. He was a renowned jazz clarinetist and educator, and was known for his eclectic style and versatility.

4. First African American mayor: On December 3, 1977, Ernest N. "Dutch" Morial became the first African American mayor of New Orleans. He served two terms and implemented important initiatives such as improving public housing and increasing minority representation in city government.

5. Hurricane season: December 3 marks the end of the Atlantic hurricane season in Louisiana. While hurricanes can occur at any time throughout the year, December 3 signifies the official end of the most active period for storms in the region.