America’s first settlers came via Alaska This February 2012 provided by researcher Mikkel Winther Pedersen shows a southward view down Cline River in Alberta, Canada, where retreating ice sheets created an ice-free corridor more than 13,000 years ago. (Mikkel Winther Pedersen via AP/Wiki Commons)
America’s first settlers came via Alaska
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Researchers have found evidence that the first Americans migrated south from Alaska via the Pacific coast. This is instead of a route hundreds of miles inland along the Rocky Mountains.
 
The colonization of the Americas began after people arrived from Siberia. They crossed an ancient land bridge. It was called Beringia. It took them into Alaska. Huge ice sheets largely blocked the way south. A gap in western Canada was long thought to provide an ice-free corridor for migration into the continent.
 
That idea ran into a problem, however. Archaeologists documented human presence in the Americas at earlier and earlier times. The corridor appeared some 15,000 to 14,000 years ago. This was as the ice sheets retreated. Now studies suggest that people had reached South America by at least 14,700 years ago. Even if one accepts the earliest date for the corridor, it's hard to believe the migration could have gone so far south, so fast.
 
So in recent years, many scientists have concluded that the first southward migrants traveled along the Pacific coast instead. They came either in boats or on land.
 
The new research was released by the journal Nature. It casts further doubt on the inland corridor. It suggests that even after the corridor appeared, it wasn't suitable for migration. At least not until about 12,600 years ago.
 
That's because it lacked plants and game. People would need these to sustain themselves on the long journey. This is a conclusion by researchers.
 
Eske Willerslev of Cambridge University and the University of Copenhagen in Denmark produced the paper. Coauthors also helped produce the paper. The paper analyzed pollen and traces of animal DNA from ancient sediments of two lakes near Fort St. John. It is in northeastern British Columbia. That general area is where the corridor last opened.
 
The paper follows another recent study of the corridor. It also concluded that it became habitable too late for the first migration south.
 
The earlier paper used a different method to assess habitability. One of its authors is Beth Shapiro of the University of California, Santa Cruz. She said in an email "it's great when two different (approaches) agree on an issue that has been unresolved for such a long time."

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Why did people arrive via Alaska instead of Greenland?
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