The 11,500-Year-Old Baby Found In Alaska — And The DNA That Revealed A Lost Branch Of The First Americans
The specific route of the main southward expansion — the expansion that produced the ancestral population of most Native Americans — remains debated.
The growing body of ancient DNA from early American sites will eventually provide more direct information about the routes taken, particularly if sites along the Pacific coast from the relevant period can be identified and sampled.
The challenge is that coastal sites from the period of initial expansion are now largely underwater, submerged by the sea level rise that accompanied the melting of the glaciers.
A Second Opening: The Genome Versus The People