I always have to remember that "the Delta" as the agricultural/economic region we see today is only 150 years old or so. Basically, by the time that full agricultural development was finished in the 1930's, agricutural tech was basically two generations away from displacing the workforce. That's a short time-frame to wipe out a region's entire economic base.
If the entire region was founded on agriculture and that particular industry no longer requires a lot of labor, there's not going to be opportunity. It's not a race issue. There's literally nothing to do in the Delta that can't be developed in other places in America that don't have such an undiversified economy. Other than the towns along the river, there's not much reason for the diffuse population across the region.
Poor white people with nothing to do and no opportunity act just like poor black people with nothing to do and no opportunity. Anybody can make a race issue out of it, but at the end of the day there's nothing for anyone except for the owners and administrators of factory farms to do there. And more of those people are doing that work remotely now anyway.
Let it return to forest and bottom land, and then steward that for hunting, tourism, etc.