Well, American natives are supposedly Russian in origin (?), and if they came from a group that had developed the paleness trait, it's feasible that in re-developing darker skin their bodies wouldn't come up with the exact same solution as the original Africans.

Native Americans are Mongoloid in decent, not Caucasian Russians.

Ah, there we go. Well, either way, Mongols are not black.

America != North America

There is substantial evidence that america was populated from the south first, though researchers can't mount the puzzle yet: https://en.wikipedia.org/wiki/Pedra_Furada_sites

I would guess it has more to do with time. People only reached the Americas relatively recently[1], from high latitude regions.

[1] https://en.wikipedia.org/wiki/Settlement_of_the_Americas

People reached America before the blue eye gene prospered in Scandinavia.

It's likely some of the alleles allowing for very dark skin were simply lost. This would be unsurprising since these people are descendants of lighter skinned people who had no need for dark skin anyway and so there was no selective pressure to retain these genetic traits.