Jefferson Davis’ Birthday, also known as Jefferson Davis Day, commemorates the birthday of Jefferson Davis, Confederate leader during the American Civil War and the president of the Confederacy.
So, I'm from Alabama and my dad worked for the state. While the holiday is terrible, it has a dope as hell placement.
They always put it on the first Monday in June, so it's always the week after Memorial Day.
As such, state offices basically shut down for a week, since everybody takes the Tuesday to Friday after Memorial Day off, since 4 days of leave gets you a 10 day stretch of no work.
Not saying it's good, but it'd be hella unpopular to repeal, and not cause people care about Jefferson Davis, lol.
So only Alabama actually observes it. It's the only one that closes state offices. Mississippi combines it with Memorial Day so technically there is a day off and they are diluting Memorial Day. I'm a Floridian and have never heard of his birthday being observed or mentioned. In contrast I actually get Juneteenth off.