Growing up, I had no idea that part of the reason Texas declared independence was because Mexico was so anti-slavery. I was taught that the reason the North and South went to war was a primarily economic reason, which is NOT an accepted platform of most historians. Its the sort of thing that would have made the Texas independence effort seem less than the kind of excellent they wanted to teach a 5th grader like me.
So while some parts of history are minimized or not mentioned, some Texas history books are now flat out wrong. Not surprising for Texas, recent changes also seem fairly racist with the push against hip hop as a part of American culture and study of the Confederacy Jefferson Davis's inaugural address alongside Lincoln's.