A couple minor errors that I have noticed right off the bat.
The region that Houston, TX resides in is called Hampstead (Hempstead is the proper spelling) but instead this region should be called Harris (or Harrisburg).
The region that lies directly between Liberty and the aforementioned Hampstead (Hempstead) is called Sabine. As Sabine is actually in the same area that Beaumont is in, the Sabine area could be renamed to Chambers (which only encompasses only part of that region) or you can name it Lynchburg (probably preferable as Chambers County also encompasses the southern part of the Liberty region). The Battle of Sabine actually took place on that southeastern-most corner of the Beaumont region.
Just east of Beaumont is a region called Lake Charles, Texas. Lake Charles should actually be the region you have named Lisbon, LA and is indeed located in Louisiana. In fact your location for Lisbon seems to be the exact location for Lake Charles, LA. The Lake Charles, TX region could be name either Orange or Newton and even possibly Jasper. Orange is probably the most preferable.
To be certain, I have taken these names form an 1860 era Texas map. If the small Confederate flags actually represent cities, those names should be changed as well (except for the city of Houston). The most obvious two flag changes would be Lynchburg where you have Sabine and Orange where you have Lake Charles.
If you couldn't guess, this is also the area in shich I was born and raised.