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[–] ditch-digger 0 points 1 point (+1|-0) ago 

That's something I'm pondering myself, the question of where do you stop breaking down the subcategories is outside of my knowledge. My assumption is that inside this portion of the definition

Species are groups of actually or potentially interbreeding populations that are reproductively isolated from other such groups

Which means that you would have to track history of clans and see which other clans they would breed with. Anthropologists would be best at answering this question.

I don't see the point in getting fussy about sub-species among modern humans

To an extent I agree, but the problem is that there is a pragmatic use to understanding which species you belong to. If the genetic makeup is too far separated the hybrid children can have a harder time reproducing, have genetic diseases, issues with racism in their daily life, are far more prone to depression, etc. Both I and my wife are hybrids, mainly on the Caucasian side, but we both have mental issues, and my wife has a couple of genetic issues (I may develop them later in life).

but such things will only ever have utility for looking at one's origins

Watch GATTACA, we're heading that way.

That's mostly because it becomes extremely difficult to track

Yes it does, and that's the game that humans are playing (for the most part) right now. I think we're already seeing the early consequences, but who knows. In a couple generations American may be it's own species if the concept of a boarder-less world is squashed.

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[–] jxfaith 0 points 1 point (+1|-0) ago 

Just wanted to say thanks for sharing.

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[–] ditch-digger 0 points 1 point (+1|-0) ago 

Thanks for having a reasonable dialog. And, my apologies if I came off as an ass (even though I really am one :) ).