During the last ice age, sea levels at the Bering Strait (where modern-day Russia meets modern-day USA [Alaska] ) were low enough that it was a continuous landmass (instead of the water separating “Russia” and “USA”) . People migrated by walking along that landmass.
This is often described as a “land bridge” but I think calling it a bridge is misleading. It’s land just like any other land at that time.
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