The Beringian Standstill Hypothesis
Although many historians believe that early humans crossed Beringia, they do not know who did so. One theory, called the Beringian standstill hypothesis, attempts to answer this.
The hypothesis says that the “Ancient Beringians” lived on Beringia in isolation due to the ice and harsh climate. If this is true, the Beringians might be the sole ancestors of all Native Americans, according to archaeologist Jennifer Raff.