1. The Louisiana Purchase Treaty was signed on September 16, 1803, in Paris, France, marking the acquisition of the Louisiana Territory by the United States from France. The Louisiana Territory comprised of 828,000 square miles and included present-day Missouri, Arkansas, Iowa, Minnesota, Oklahoma, Kansas, Nebraska, North and South Dakota, and parts of Montana, Wyoming, Colorado, and Louisiana.

2. The Battle of Valverde took place on September 16, 1862, in New Mexico. It was a major Civil War battle fought between Confederate and Union forces. Despite being outnumbered, the Confederates won the battle, securing control of the Rio Grande Valley.

3. The first Louisiana State Fair opened on September 16, 1906, in Shreveport. The fair showcased the state's agricultural and industrial products and attracted thousands of visitors from across the region. Today, the Louisiana State Fair is one of the largest state fairs in the country, attracting over 400,000 visitors each year.

4. On September 16, 1928, the Okeechobee Hurricane struck Louisiana's Gulf Coast, causing widespread destruction and claiming hundreds of lives. The hurricane was one of the deadliest natural disasters in the state's history.

5. The Louisiana World Exposition, also known as the New Orleans World's Fair, opened on September 16, 1984, at the city's historic riverfront. The fair featured exhibits from over 50 countries and attracted over 7 million visitors during its six-month run. It is remembered for its iconic "Wonderwall," a 60-foot high sculpture made of light and water.