1. 1803: The Louisiana Purchase is finalized
On October 20, 1803, France ceded Louisiana to the United States as part of the Louisiana Purchase. The territory, which spanned from the Mississippi River to the Rocky Mountains, doubled the size of the United States at the time and played a significant role in the nation's westward expansion.

2. 1864: Battle of Cedar Creek
The Battle of Cedar Creek, fought on October 19-20, 1864, was one of the last major battles of the Civil War in Louisiana. Union forces, led by General Philip Sheridan, launched a surprise attack on Confederate troops, resulting in a decisive victory for the Union.

3. 1884: DeSoto Parish is Established
On October 20, 1884, DeSoto Parish was officially established in northern Louisiana. Named after the explorer Hernando de Soto, the parish is known for its rich history, abundant natural resources, and diverse culture.

4. 1967: The Louisiana Superdome is Completed
The Louisiana Superdome, a massive indoor arena located in New Orleans, was completed on October 20, 1967. The venue has hosted numerous events over the years, including Super Bowls, NCAA Final Fours, concerts, and political conventions.

5. 2013: The Bayou Bridge Pipeline Project is Announced
On October 20, 2013, Energy Transfer Partners announced plans to build the Bayou Bridge Pipeline, a 163-mile-long crude oil pipeline that would extend from Lake Charles to St. James Parish. The controversial project faced opposition from environmentalists, indigenous tribes, and local communities concerned about the pipeline's potential impact on the environment and public safety.