I snipped it from a longer text showing a dozen or so examples of Africans arriving in the South America long before Columbus.
It has the name of the polish professor that found the skeletons shown. You have Google or Bing or whatever’s your thing. If interested you’d search. If you want to debate as if the only universe is you and I and whatever words we pick, then you’re interested in debate, not research.
It’s absolutely a tricky subject.
Statements such as:
“A complication in studying Native American genetic history is admixture with European and African immigrants since 1492″
is more making more of a political historical statement based upon current tradition than anything confirmed.
The sentence would work without “since 1492″ and the frequent mentioning of “post-Columbus” in the article but this is a crossover area.