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Changing the title also is probably a good idea:

"Northwestern Vancouver Island Likely Escaped the Ice Age"

A lot of ancient roads are still known about today:

* https://en.wikipedia.org/wiki/Historic_roads_and_trails

Some modern thoroughfares (roads, highways, rail) simply built on the paths of used by Indigenous people:

* https://indiancountrytoday.com/archive/aboriginal-pathways-a...

Some of those trails were on the migrations paths of animals, e.g., buffalo/bison.

"As early as 18,500 years ago, the Americas’ first peoples spread south from Beringia, a now-sunken continent between Asia and North America."

When was this written? The Bluefish caves in the Yukon date back to 24 thousand years ago.

This is an intriguing article, and very well worth a read, once you get rid of the pop-up.

Over at the other side of what is now called Canada, archaeologists are making lots of interesting discoveries (see e.g. https://www.cbc.ca/news/canada/nova-scotia/mi-kmaw-archeolog...).

Given the boats that enabled spread into Poly- and Micronesia (and DNA making it to South America), I'd not count out trekking via the Aleutian Islands for some sailors as well.
"Indigenous" oh so every human on the planet.