Actually I had a problem with that map too if you are referring to the one posted today showing ancestral tribal lands. There is no mention of the Karankawa tribe who lived along the Gulf Coast. Interestingly enough they are one of at least two Texas tribes known to have practiced ritual cannibalism, the other being the Tonkawas.

I lived in Houston for nearly 10 years and totally agree with the poster you replied to, that area is a shithole that is really unpleasant if you don't have air conditioning. The local tribes were mostly naked and covered themselves in mud to avoid the mosquitoes so they had workable options they employed.