All right, time and geological travel in the same post.
(in part)
Number of Migrations
Physical anthropologists have shown that the craniometrics of the earliest Americans (i.e., "Paleoamericans" like Kennewick, Spirit Cave, Lagoa Santa) are significantly different from those of more recent Native Americans. Working under the assumption that craniometric variation is neutral and therefore phylogenetically significant,
they interpret the differences to reflect two successive migrations stemming from two geographically or temporally distinct sources. Accordingly, Paleoamericans arrived in the New World and were later replaced by ancestors of modern Native Americans.
source: Center for the Study of the First Americans
*Speaking of sources, when material is c&p here you should be citing the source of the page or work. Wouldn't want someone to accuse you of plagiarism or worse.
Long ago and far away there were some people living by the seashore. Over a relatively short period of generations the waters rose more than 400 ft and showed no signs of slowing. The decision to vacate the home was solved bu cutting down all the trees in North Africa and sailing to Central America on rafts. The immigration pattern went mostly south and they survived and eventually moved even further west as far as Australia before the African features were faded by time. The few that migrated into the lower part of North America died out. Once Australia had been reached the migragation moved north and slowed in expansion but developed large Nations with large populations. The one in China also went north and the east to North American and then South America for the 2nd time. The spread went west from China into Europe, that last place of the global migration.
How do we know the first Vikings didn't do their raiding down to the Canary Islands, said/float to America, trade or raid for another load of supplies and use the gulf current float back to the starting point. Coming west across the northern current would have been a deadly task compared to going with the wind in a storm. Let alone having to beat the ice off the sails.
