Thank you for admitting that you have no informed basis for what you are talking about. That takes honesty and courage.
There is no “downtown New Orleans”. Take a look at a map.
The French Quarter has a minuscule black population. There are blacks in almost every ward, so in order to accomplish what you suggest, the majority of the city would have to be depopulated. And the cattle cars should take between 250,000 to 500,000 people where? Will you build the concentration camps in Texas, or perhaps further away, say, in Wyoming?
Will your round-up include Stella Jones, the owner of an internationally famous art gmallery? What about all the black cooks who have made New Orleans one of the most important restaurant cities in the U.S.? How about the jazz musicians - you could start with the pianist Ellis Marsalis, the father of Wynton Marsalis, and work your way over to Fats Domino and the Neville Brothers - and don’t forget the clarinetist Dr Michael White, who teaches at Xavier University. Then there are the dozen or so brass bands, of older men who pass the traditional music onto the next generation. After the musicians, you can round up all the small business owners, then all the men who work on boats on the river and the ports, and the electricians, plumbers and carpenters.
Then you’ll have a nice, nearly-empty city - of course, there will be almost no services after you’ve made it schwartzer-rein - but I’m sure you have a solution for this.
No matter how accomplished all those fine people you described are, the baggage that surrounds them is a killer for the city.
No thank you on Texas taking them. We got more than our share during Katrina, and most of them stayed in Houston. Brought their violence and criminal ways with them.
But many of the displaced do not like the way things are done here in Texas. The old tribal ways won’t work here.