There are several viable theories of how humans arrived in the Western Hemisphere, neither is exclusive of the other. As Rooster alluded to, there were at least two periods of migration across the land bridge at the Bering Strait, which is the most widely accepted theory; as well as by sea (though a far smaller … Read more
The question of who colonized the Americas, and when, has long been hotly debated. Traditionally, Native Americans are believed to have descended from northeast Asia, arriving over a land bridge between Siberia and Alaska some 12,000 years ago and then migrating across North and South America
According to this article, the remains are Native American.