The only thing I can vaguely recall going against the norm was mention of the current location is not the original location, but cannot recall if anyone knew for sure, or was a rumor, or myth, or what. I believe it's been confirmed since that the original location is not where the current museum is, or perhaps like very close as much of the old fort was destroyed over the years.
But it was repeatedly told to us it was heroic Americans fighting an invasive, foreign army. Certainly do not recall any Mexicans or Tejanos being on the "good" side in our books and lectures.
Texas has a lengthy history of writing their own school books and also selling them to other states.