The Bering Land Bridge is the submerged land that connects Alaska and Asia. The earliest known drawing of the Land Bridge is by Adolph Knopf in 1910 and his sketch was remarkably accurate. It has now been proven that the land bridge appeared as early as the last ice age as all the glaciers made the level of the seas drop so far down that the land bridge was exposed.
The Bering Land Bridge appeared and disappeared many times. Some times when the Bering Land Bridge appeared the sea level dropped so much that the Land Bridge even connected the St. Lawrence Island. Many animals and mammals crossed over the land bridge one of the times it appeared; those animals and mammals were the wolves, arctic ground squirrels, red foxes, tundra hares, wolverines, beavers, moose, dogs, puffins, brown bears, elk, weasels, mountain. goats, deer, arctic hares, black bears, skunks, and of course, humans. All these types of life still exist today.
There are many more animals that crossed that are now extinct, or they don't live here in Alaska now, such as the woolly rhinoceros, yaks, ermine, lynx, lemmings, voles, badger, bobcats, coyotes, short faced bear, saber tooth grizzly, cheetahs, brown lemming, saiga, ground sloth, badger, woolly mammoth, lion like cat, snow sheep, forest bison, ermine, plains bison, big horn sheep, and reindeer. Reindeer live in Alaska now, but they were imported. When Wisconsin sea-level recession was at its maximum, more than 100 meters below the present levels of the sea, the entire floor of the Chukchi Sea and the northeastern Bering Sea must have been exposed coastal plain that being dissected and denuded by streams. The most recent siting of the Bering Land Bridge was, in general, an exposed crystalline rock surface just south of the Bering Strait and an exposed sedimentary rock surface just north of the Bering Strait. After the uplift of the adjoining reefs during the great Alaskan earthquake of 1964 exposed additional beds settlements.
When these animals crossed the land bridge, people from Asia who were hunting these animals followed them into North America. This is how the Tlingits, Haidas, Tsimshian, Eskimos, Aleuts, and Athabascans came to Alaska.