None of this was ever "covered up" that I remember. We were taught much of in Texas History classes.
Not to mention what we find on the history channel. [smile] Look at what they did with the Alamo. (I enjoyed that particular documentary, though)
I think what we have going on, as reviewed by the Houston Chronicle via the New York Times Service, is academic bone sifting. The story you tell depends on which pile you drop your old bone onto. Voila, a new historical revelation!