1. Hurricane Katrina made landfall on August 20, 2005, causing widespread devastation and flooding throughout Louisiana. The storm resulted in hundreds of deaths and billions of dollars in damage.

2. August 20, 1812, marked the beginning of the Battle of Borodino during Napoleon's invasion of Russia. A significant number of Louisiana soldiers fought in this battle on the Russian side, as they had been recruited by Napoleon during their time as Spanish soldiers in Louisiana.

3. On August 20, 1866, Louisiana became the first state to enact a new Constitution that extended full citizenship and voting rights to Black men. This was a significant step towards greater equality in the United States.

4. The Louisiana Purchase was formally transferred from France to the United States on August 20, 1804. This historic transaction doubled the size of the country and greatly expanded its territory westward.

5. Louisiana's "Acadian Day" is celebrated on August 20 each year in honor of the Acadian culture and heritage that has played a significant role in the state's history. The Acadians were French settlers who were expelled from their homeland in modern-day Canada in the mid-18th century and later resettled in Louisiana.