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 The video was about native Americans, where and when did they come from. They are from Asia and north east Asia. There was a big iceage 11 thousand years before, so  people think Asians started to immigrate to America after the ice melts. However, archaeologists found skulls. They invastigated the radiocarbon dating the skulls are older than the iceage. Therefore, archaeologists concluded that the Asians immigrated before the iceage and the shores which were not frozen during the iceage. I also think people had immigrated before iceage started because Russia and America is not so far. Even early Asians did not have a technology to make an airplane, but at least they could walk a frozen sea..