What temporary land mass linking siberia and alaska is thought to have allowed hunter-gatherers to migrate from asia to north america?

The answer to this question would be “Beringia”.

Today, Beringia is  the land and marine area bordered on the west by the Lena River; on the east by the Mackenzie River; on the north by 72 degrees north latitude in the Chukchi Sea; and on the south by the tip of the Kamchatka Peninsula.

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length of the cultivating season was not a problem of new england agriculture