When we come to the question of the settlement of America from the Asiatic side we can say with more certainty that immigration proceeded from that continent by way of Behring Strait, and was of a Proto-Mongolian character, though the fact should not be lost sight of that within a few hundred miles of the point of emigration there still exists the remains of an almost purely Caucasian type in the Ainu of Saghalien and the Kurile Islands. However, immigration on any extensive scale must have been discontinued at a very early period, as on the discovery of America the natives presented a highly specialised and distinctive type, and bear such a resemblance one nation to another, as to draw from all authorities the conclusion that they are of common origin.
According to all known anthropological standards the Amerind (as it has been agreed to designate the American Indian) bears a close affinity to the Mongolian races of Asia, and it must be admitted that the most likely origin that can be assigned to him is one in which Asiatic, or to be more exact, Mongolian blood preponderates. The period of his emigration, which probably spread itself over generations, was in all likelihood one at which the Mongolian type was not yet so fully specialised as not to admit of the acquirement under specific conditions of very marked structural and physiological attributes.[1] In recent years large numbers of Japanese have settled in Mexico, and in the native dress can hardly be distinguished from the Mexican peasants.
Of course it would be unsafe to assume that, once settled in the Western Hemisphere, its populations were subject to none of those fluctuations or race-changes which are so marked a feature in the early history of European and Asiatic peoples. It is thought, and with justice, that some such race-movement convulsed the entire northern division of the continent at a period comparatively near to that of the Columbian discovery. Aztec history insists upon a prolonged migration for the race which founded the Mexican Empire, and native maps are still extant in several continental collections, which depict the routes taken by the Aztec conquerors from Aztlan, and the Toltecs from Tlapallan, their respective fatherlands in the north, to the Mexican Tableland. This, at least, would appear to be worthy of notice: that the 'Skraelings' or native Americans mentioned in the accounts of the tenth-century Norse discoverers of America, by the description given of them, do not appear to be the same race as that which inhabited the New England States upon their rediscovery.