According to a new study, the earliest Americans were having singularly Siberian origins; they entered the continent through the Bering land bridge. The study has been published in the journal Science. Another study suggests that several early Native Americans could have had come from Australia and its neighboring islands, which is an area known as Australasia.

Different people who lived in Americas are considered as a topic of great interest, when it comes to anthropological and archaeological aspects. As per reports, there are evidences of unique culture on the continent more than 10,000 years ago; however, it is still not clear that how these populations reached the continent and from where these people came.

As per reports, the migration could have begun between 20,000 and 40,000 years ago. However, some researchers said that glaciers in Alaska would have blocked the way into North America. According to the Beringia standstill hypothesis, population of humans would have continued to be stranded on this land bridge approximately 15,000 years before passage into the continent became possible as a result of ice melt.

According to experts, some early American skeletons were found with physical features different from those of historic and modern Native Americans.

According to Pontus Skoglund, who co-authored the study published in the Nature, "They have suggested that this morphology matches more closely with Australasian populations. But there has always been this question of how statistically informative this morphology is, and to what extent this actually reflects population relationships".