[Map Kernow]

The Inuit and Aleut are Eskimos. Na-Dene peoples are a small portion of current American Indians (Navajos are the largest group, I believe.) The author is ACTUALLY saying MOST of the current American Indians, based on his study, came here 15,000 years ago and are more closely related to the Ainu, etc.

Seriously, folks, see the thesis of the late Joseph H. Greenberg's "Indo-European and its Closest Relatives," positing a Eurasiatic super-language family, encompassing Indo-European, Finno-Ugric (Uralic), Altaic (Turkic etc.), Nivkh (Gilyak), Chukchi-Koryak-Kamchadal, Japanese-Korean, and Eskimo-Aleut. The Amerind languages (first wave of migrants as opposed to second) are in turn the languages most closely related to the languages of this "Eurasiatic superfamily," according to Greenberg.

[RightWhale]

Eurasiatic super-language family, encompassing Indo-European, Finno-Ugric (Uralic), Altaic (Turkic etc.), Nivkh (Gilyak), Chukchi-Koryak-Kamchadal, Japanese-Korean, and Eskimo-Aleut.

Sounds like an early split between cold-climate groups and warm-climate groups.