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Who is "they"? It looks like the origin is coming from a quote by Larry Callies who runs the Black Cowboy Museum. Is everything quoted correct? I don't know but it read as a fun story that may be some mix of truth / story and probably heavily location specific. I am not sure sure that would classify as "race-baiting".
There are articles of slavery and race in TM but I would not classify it as more than 25% maybe?