1. The Louisiana Purchase Treaty was signed on April 22, 1803, in Paris, France. This agreement transferred ownership of the Louisiana Territory from France to the United States, doubling the size of the young nation and setting the stage for westward expansion.

2. On April 22, 1861, Louisiana became the sixth state to secede from the United States and join the Confederate States of America at the outbreak of the American Civil War. The state's strategic location and significant economic interests made its secession a pivotal moment in the conflict.

3. The Port of New Orleans reopened on April 22, 1960, after being closed for several months due to a labor strike. The port's vital role in the state's economy and transportation network makes this event significant in Louisiana history.

4. On April 22, 1970, Louisiana celebrated the first Earth Day, a nationwide movement focused on raising awareness about environmental issues and promoting sustainable practices. Louisiana's unique wetland ecosystems and ongoing efforts to protect them make this event particularly relevant to the state.

5. In 1993, the Louisiana legislature passed the Coastal Wetlands Planning, Protection and Restoration Act, which created a framework for restoring and preserving the state's rapidly eroding coastal wetlands. This landmark legislation has had a significant impact on Louisiana's environmental and economic future, making April 22 an important date in the state's ongoing efforts to protect its natural resources.