Stone tools suggest the first Americans came from Japan 
Comparison of Cooper’s Ferry projectile points with late Pleistocene age Tachikawa-type stemmed points from the Kamishirataki 2 site on Hokkaido, Japan. (A) Stemmed projectile point haft fragment from LU3 (B) Illustration of Japanese Upper Paleolithic stemmed projectile point from the Kamishiritaki 2 site (C) Blade fragment of projectile point from LU3 (D) Stemmed projectile point haft fragment from LU3 (E) Illustration of Japanese Upper Paleolithic stemmed projectile point from the Kamishiritaki 2 site as one possible comparison for the reconstructed stemmed projectile point shown in (C) and (D). (F) Stemmed projectile point from PFA2 (73-627). (G) Stemmed projectile point from PFA2 (73-628). (H) Stemmed projectile point from PFA2 (73-626). (I to K) Illustrations of Japanese Upper Paleolithic stemmed projectile points from the Kamishiritaki 2 site
This is what the Columbia River basin would have looked like 16,000 years ago.