First Americans Came By Sea
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Have you heard about the Mal'ta child? Archaeologists found the skeleton of a 4 year old boy from eastern Siberia who was related to Middle Eastern or European populations and also Native American populations. But he was NOT related to East Asian populations. So they hypothesize that his tribe migrated east from Europe or western Asia, then later joined the migration into North and South America. That would account for the portion (about 1/3) of European-related DNA in pre-Columbian Native American populations.
This contradicts the 'Solutrean' theory, that accounts for the presence of European DNA in ancient Native American populations by a migration along the North Atlantic ice cap from Europe.