You love a good strawman - where did I say that?
First of all, race is not really a thing, so you're on the wrong foot straight away.
But you have simultaneously darker skinned people in Africa, South America, Australia, South Asia. 4 continents, people with similar skin tones all around. South Americans and Australians (pre-colonial times) actually had very similar facial features despite being separated by a massive ocean (that's the pacific, if you didn't know). A lot of indian natives are as dark as most Africans, for example.
You had people with dark skin tones in north europe before the Roman Empire - that was around 2k years ago. You had darker skinned people (we're not sure how dark) In Ireland about 5 or 6 thousand years ago, they even built things!
Newgrange, Knowth, Dowth, Fourknocks, Loughcrew and Tara are Neolithic period Megalithic Passage Tomb Monuments located in Meath, Boyne Valley, Ireland
www.knowth.com
You also had fairer skin colours in Africa - Including Roman Emperors that were blonde with blue eyes despite being South Italian, hell, even Cleopatra was olive skinned. It goes before this, because land bridges in europe, especially north europe, existed before.
I could keep going, but this is not a history lesson.
Here's what I said:
Gengis Khan existed, perhaps pick a book.
I never said this, but I think I got it - for you skin colour is a part of someone's culture, right?