The first Mongoloids, as Gladwin sees it, were the Eskimos. They came to the northern edge of North America about 500 B.C. But, because they clung to that edge, we must look elsewhere and later for a Mongoloid invasion of the cultural areas of the New World. Gladwin believes that these second Mongoloids were thrust out of northern China and on into the New World by the ferment of the Huns. They reached Alaska about 300 B.C. Ultimately, supplemented by the Uto-Aztecans, they supplied the man power on which the Mexican and Maya civilizations were built; and some reached the west coast of South America.[30] Without a good many of them it seems to us difficult to account for such Andean peoples as the speakers of the Quechua and Aymara languages, who were the working population of the Chimu, Nasca, Tiahuanaco, and Inca cultures. By Gladwin’s dating, the Mongoloids had only a little more than a thousand years to stamp their hair and eyes and teeth upon five million to fifty million men and women in both Americas. By the time of the Algonquin—let alone the Eskimo and the Aztec—we are far out of the era of early man. But we are not yet through with the theories of Gladwin as to the peopling of the Americas; for, not content with the stimulating activities of the Huns in northern China, he rediscovers the sailors and the Asiatic fleet of the late, great conqueror Alexander of Macedon, and leads them on expeditions through the East Indies and Oceania even to the Gulf of Darien.[31] However heretical Gladwin’s suggestions may be, they deserve serious attention if only because they bear heavily upon an old quarrel of the archaeologists, and because this old quarrel bears upon the antiquity of man in the Americas. To be sure, it has to do with the Indians who made the civilizations of Middle America and Peru two thousand years ago, and not with the earlier men who did no more than hunt or gather, and who made nothing more remarkable than Folsom and Eden points or milling stones. But by studying certain aspects of those civilizations we may recognize that the Indians had been in the Americas 3,000 to 5,000 years before Columbus. By so much we may reenforce the theory that their forerunners or their forebears came to the New World at least 15,000 years ago and probably 25,000 or more years ago. Siberian Caucasoids Since 1950, Joseph Birdsell and Carleton Coon have done something to clear a little of the mist that has obscured the physical origins of man in the New World. They agree, more or less, that the first migrants were of Caucasoid stock from the basin of the Amur River, in northeast Siberia.[32]