According to the North American archeological and Aboriginal genetic evidence, North and South America were the last continents in the world to have human habitation.[1] During the Wisconsin glaciation, 50,000 – 17,000 years ago, falling sea levels allowed people to move across the Bering land bridge (Beringia) that joined Siberia to northwest North America (Alaska).[2] At that point, they were blocked by the Laurentide ice sheet that covered most of Canada, confining them to Alaska for thousands of years.[3]