1)About 23,000 years ago, a single group splintered off from an East Asian population. The group, hailing from northeast Asia, crossed the Bering Land Bridge between northeast Asia and Alaska, eventually making their way to the rest of the Americas. About 13,000 years ago—much more recent than previous theories—Native Americans started to split into different groups, creating the genetic and cultural diversity that exists today.
2)As far as I know, there is the theory of the land bridge.
3)They are from Asia.
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5)Nowadays, native Americans live in America