Light skin is a uniform identifying characteristic of all Polar peoples.
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What about the Inuit?
And many in northern Russia (which is where the Inuit presumably came from).
I didn't say they can't tan ~ they can ~ the Inuit have been living in the Polar regions for only a few thousand years ~ not at all like the Sa'ami ancestors of the Europeans who've been doing that for a few tens of thousands of years.
I can show you a few of those fellers who don't tan and can't imagine tanning.