Dark People were/are Cro Magnon (and maby other dark root races) They were in Africa. (and maby other southern continents)

Light people were Neanderthal (and maby other light root races0 They were in Europe and Asia and North America.

The very Earlyest Olmec sites had images of White, and of Black peoples, no one in between {See Graham Hankock's youtube}

The Dark people conquered the lighter peoples in All the places the lighter people lived. All the various races we have now, except pure black, are mixtures of Cro Magnon and Neanderthal and whatevet other root races were involved.

The more light genes left in the race the lighter the race. The more dark genes the more dark the race.

The lightest races left on Earh are still mostly Cro Magnon, Unless they have some how missed the sampling scientists have been doing. Or there is another light race besides Neanderthal. The samples scientists have taken of 'white people' dont have a remsarkably high percentage of Neanderthal, but that is what makes them 'white'.

The 'native' Indians are a dark mix of mostly Cro Magnon/dark roots with just a dash of Neanderthal / light roots.