Well, not to stand on a soap box here, but the teaching of history today seems to have been simplified. Most schools teach the kids that the Civil War was a single issue war (slavery), when they should teach that war was fought over several economic, political and cultural issues, but hostilities didn't break out until the states started to leave the union. The emancipation took place years later after the war started, and then it only applied to the southern states.
I guess my point is that ignorance is a driving force behind a lot of politcal correctness. I have never understood it, or any atempt to re-write history. If we follow their logic, shouldn't Disney boot out Germany (for the holocaust) and Japan (for the enslavement of Korea) out of EPCOT too ?