The first Americans were not the product of a single clean founding event; they were the product of a complex Asian population history that included movements, mixtures, and divergences stretching back tens of thousands of years before anyone reached Beringia.

That complexity is not a problem for understanding Native American history.

It is part of that history — the deep ancestral history that connects the people of Lagoa Santa not just to the Americas but to the full global history of humanity, to the migrations that spread our species from Africa to the far corners of the world, and to the ancient populations in Asia and Australasia who share, in the specific statistical sense that genomics can measure, some portion of their deep ancestral heritage.

The signal in the ancient Lagoa Santa DNA is, ultimately, a thread that connects these ancient Brazilians to the full human story.

Not by suggesting that Australians sailed to Brazil, but by revealing that the deep ancestral history of all modern human populations is more interconnected, more complex, and more interesting than any simple origin story can capture.

That is the lesson that keeps emerging from the genomic revolution in human prehistory, and the Population Y debate is one of its clearest illustrations.

— COMPLETE FINAL END —