I didn't think caucasian could be a racial slur, although I don't really
like it myself. I consider honky (depending on the context that it's
used), and cracker to be racial slurs.
Actually, there has been new scientific evidence that some of us may
have origiated in Eurasia. There has been a new species discovered
that is nicknamed "hobbit", and it's similar to humans. It could be
that there was a branch of humans which originated in Eurasia. It was
on a documentary I saw. So, it's possible that all of us are not of
African descent.