Still resisting the ever growing evidence of first population from Europe, I see. Anthropologists have, since the 1970s, drunk deep from the beaker of politically correct poison.
The Neandertal Enigma"Allan Wilson had always been described to me in superlatives, such as 'one of the real geniuses in science,' or 'the most arrogant guy I know...' [H]e apologized for putting me off so long and bluntly explained that the reason he had done so was that he did not trust me... 'The anthropological perspective on evolution is no longer valid; it has been overthrown. And yet the science writers who insist on talking to me come drenched in an anthropological perspective, and there is really no point in talking to them... It is paralytic. It prevents you from asking certain questions, and it forces you to ask others. The whole discipline invites you not to investigate.'
by James Shreeve
...A few months before my visit, Wilson had announced at the annual meeting of the American Association for the Advancement of Science... that the Neandertals were replaced because they could not speak... suggesting that a particular gene for language might have been carried in the mitochondria themselves. Since invading males would have been more likely to mate with resident females than the other way around, the offspring of sexual contact between the two groups would be 'linguistically deaf-mute,' like their Neandertal mothers. Thus disadvantaged, these 'village idiots' would face the same fate as the mothers: extinction. Only the language-endowed African lineage would continue. The language gene idea, and especially the unfortunate term 'village idiots,' elicited hoots of derision from the anti-Eve camp, and gave no joy to Wilson's colleagues." [pp 119-121]
Much of what is coming out now is rethinking of old evidence in light of different theories along with newer evidence. The probability of sea borne migrations has traditionally been ignored, because almost all Archeology sites are on dry land, and boats would not leave tell tale traces in many sites. However, most boats until well into the Iron age were not suited to long voyages (greater than 1 week) of the type required to reach the Americas reliably. The Polynesians did do long voyages, but many islands were only visited by one or two boats before European contact.
The resemblance between Clovis and Solutarian stone work may not be an accident, but it does not require a large number of Europeans, there need only be one lost stone master and willing students. Eastern North America was populated before the Clovis culture and some evidence exists for that culture having spread from the US South East.