The 9,000-Year-Old Child’s Tooth Found In An Alaska Cave — And The DNA Test That Revealed A Lost Population Of The First Americans
Population replacement, in whole or in part, is one possibility.
If other Native American populations — specifically Northern Native Americans — expanded into the areas where Ancient Beringians had been living, they could have numerically overwhelmed the Ancient Beringian population and replaced their ancestry in the population mix of subsequent generations.
Complete replacement — a situation in which Ancient Beringian ancestry left no descendants in later populations — is one endpoint of this process.
But complete replacement is not the only possibility.