Side note: Louisiana was effectively the last state to raise its drinking age to 21 because of a sale loophole that let bar owners sell alcohol to 18-20 year olds. Curious legal case from 1996:
"For years, she and other advocates worked to sew shut the loophole in a Louisiana law that protected bar owners from prosecution for selling alcohol to those between 18 and 20, even as it barred those teen-agers from buying alcohol. They won last year, or at least they thought so, when the Legislature banned the sale of alcohol to those under 21.
But then last week, the Louisiana Supreme Court ruled that the state's drinking age of 21 is a form of age discrimination, and tossed out the 1995 law as well as the 1986 law that barred those under 21 from buying alcohol. Louisiana has become the only state in the nation with a drinking age of 18."
https://www.nytimes.com/1996/03/23/us/louisiana-stands-alone-on-drinking-at-18.html