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"It also seems Australian Aborigines also populated South America before the arrival of Asian ice bridge peoples. "

Yes. It's starting to look like the Aborigines from Oz could be some of the earliest if not the first. (Luzia)

"That does not mean the Amerian ancestors were Europeans or anything like that if Ainu-like."

I agree. The question of the origins of Ainu-Jomon, as far as I'm concerned, is still unsettled. James Chatters has proposed the most palatable (to me) scenerio. That is, that who-ever the Jomon-Ainu ancestors were, they are likely to be the ancestors of present day Europeans, Polynesians and Asians. I think there was a lot of back and forth mixing going on in Siberia >100,000 years ago in a multiregional scheme. The Ainu may have gotten a genetic 'refresh' as early as 5-6,000 from the Euro-Asian steppes. There is limited (some) genetic support for this scenerio.

Now, there does seem to be some evidence of (more recent) Europeans on the east coast of the US, probably arriving in fits and starts themselves.

Not well understood but the European peoples are in reality Central Asians in our distant past. Even the vowel heavy Indo-European tongues are an indication of a wandering nomadic herder sosciety where sounds had to travel far as they tended their moving flocks.

Nor did our ancestoral features resemble the ones developed in Europe. Arrival in Europe also changed the physical make-up of these people. We forget how clay like our bodies are over generations.

Now, there does seem to be some evidence of (more recent) Europeans on the east coast of the US, probably arriving in fits and starts themselves.

There is this theory that I read and makes sense-during the Bronze age - tin was such a rare commodity that Phoenicians and other tin searchers travled long and far in search of this commodity. They kept such routes secert from mouth to mouth. When the bronze age came to an end, the value of tin for making bronze evaporated and the routes were forgotten except in some half remembered tales by the Phoenicians that the Greeks picked up on and wrote about. That age probably saw limited colonization maybe a trading fort or something-no women but local Indian women. Some slaves - probably Celtic slaves and or Negro slaves to the Phoenicians? This would explain the cocaine and tobacco found in Egyptian mummies. They were Phoenician trading goods and these Phoenicians lept such routes a trade secret.