人类最初是怎样到达美洲的？新的研究或揭开真相

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最早的美国土著居民是怎么来到美洲这块土地的呢？一项新的研究表明他们可能是通过沿海路线和内陆路线两种方式来到美洲的。

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How did people first get to America? Now, a new study concludes that an inland route through present-day western Canada along with a route along the Pacific coast should be considered as ways for the first human into the Americas.
The inland route theory–known as the “Ice Free Corridor”–suggests humans moved across present-day Alaska and the Yukon, then took a right turn between two huge ice sheets. They then traveled along the British Columbia/Alberta border into the northern Plains of the present-day United States.
The other “North Pacific Route,”also known as the “Kelp Highway,” said humans traveled along the west coast of North America.“We can’t exclude either coastal or inland routes for the first Americans,” study lead author, Potter said. “I suspect both probably were used.” He added that “what we wanted to do was to provide a way to discuss the traveling process–not based on speculation but rather on a careful and critical review of the current evidence we have.”
“There really is growing archaeological record and the genetic records,” he said. “As researchers from different fields work together in a respectful and beneficial manner,” the study said,“the opportunities to analyze additional human remains to infer population history in the Americas grow.”
Current evidence shows that there are three primary branches of Native American ancestors. One group, southern Native Americans, walked through all of North and South America. Another group, northern Native Americans, are present now in northern parts of North America. A third group, Ancient Beringians, were located in the far north, in Beringia and present-day Alaska and the Yukon Territory.
And as for when this all happened, the data suggests that “traveling occurred between 16,000-14,000 years ago,” Potter said. The study argued that more research is needed to determine how the migration occurred. “We’re saying there’s not enough evidence yet–we need more science on both routes.”