What's a "Nubian"?

Kim Kardashian and her littermates puzzle me. Who are they, where did they come from, and why are they here? By which I mean, What have they done to earn anyone's notice? As far as I can tell (from precious little evidence — I know they have a show but I don't watch it, so I get most of my precious-little evidence from Go Fug Yourself and The Frisky), they are dime-a-dozen attention whores who have no talent, no skill, and no more attractiveness than any other D.-a-D.A.W.s. They're an "Emperor's New Clothes" "property."

None of this answers my questions, though. This guy has it exactly right, wondering "WTF is a 'Kardashian'?", almost word-for-word the question that comes to my mind whenever one of them enters my awareness (I replace the "F" with an "H").

I think I've figured it out, though. I think they're from Kardashistan, some pointless oligarchy in the wastelands of central Asia, whose people are properly known as Kardashis but who ignorant "The Kardashians"-watching Americans call Kardashians (like they call people from Argentina, Argentinians).