Louisiana is one of the only states in the South where the population is actually declining. There have been some people moving to the state, but there have also been a lot of people moving out. They're tired of having to rebuild after every story, only to be unsure if rising seas aren't going to completely swallow their communities in the future. Add to that high levels of poverty, and it gets clearer why many are leaving.
However, hopefully, the trend will change in the future because it's one of the most unique places in the U.S., and its culture, food, and nature make it a really special place to live.