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I have seen news reports saying that in recent years many more scientists think that humans first arrived in the Americas by boat, along coast of Alaska and Canada (before they were able to come through the Bering Strait land route). They would have done this ocean journey during the last ice age. Would this coast have been an ice cliff at that time? If so, such a long journey along such a coast must have been quite difficult. In other words, would early humans have had to follow along a coast that looked something like this picture below? Thank you in advance for any thoughts you can share on this.Iceberg

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    $\begingroup$ I think you can't speak of one single journey. This probably was rather a matter of generations and centuries, maybe even millenia. Some tribes ventured along the coast in Eastern Russia, found some place to settle, it got crowded, some of them ventured further east, maybe only for the summer, etc, pp. (Source: My own logic understanding of how humanity spread). $\endgroup$
    – Erik
    Jun 15 at 7:23
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West of the Continental Divide it is the Cordilleran ice sheet.
I think the blue line here would have been ice shelves where it is in deep water. It also shows some ice-free land (note, sea level was 125 m lower).

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