While mulling over this topic, I was thinking about the ways history used to be taught (not just in schools, but also in popular culture, family history, etc.) and how many approach it today. There's been a great deal of controversy and argument over how to teach about America's past, because it forms perceptions of who and what we are, as a nation and people.
When it came to slavery, I don't think there was any attempt to deny it, as there was also quite a focus on how slavery divided the states and the Abolitionist movement which staunchly opposed slavery. The greatest Abolitionist of them all, Abraham Lincoln, achieved near godlike status in the eyes of the generations of Americans which followed. At least in terms of shaping Americans' historical perceptions, Lincoln was it.
In a sense, at least when Americans look at our historical past and the crimes of slavery and the slave trade - along with the patriotic extolling of the personage of Abraham Lincoln, the Great Emancipator, it's almost as if Lincoln died for our sins (along with hundreds of thousands of troops who died in the Civil War).
Of course, this may be different from the "Lost Cause" Confederate version that's also circulated, but that in no way diminished the general public's historical adoration and admiration for Lincoln. He became a symbol of what America stood for.
Those who seem to look at it from a more Confederate position tend to focus on different aspects, although one could still argue from a pro-Confederate position without necessarily being a slavery apologist or revisionist, which is what this "involuntary relocation" seems to be. If Texas wants to tell its own history from its own perspective, then they can do that, but they might also mention that Sam Houston was against secession.
I guess the bottom line is, there's no reason to lie about anything in our history. As long as we tell the complete story, both the good and the bad, then we can have a better idea of where we stand today and how we should plan for the future.
Ultimately, I don't think history should be used as a vehicle for attempting to BS people into following a certain political agenda in the here and now.