I'm rereading the first few chapters and I can't find it. After the fall of the world state it it is said that the next civilization comes from the indigenous Peruvian. Pretty much every group but Peruvians is excluded.
"It happened also that in South America the racial conditions were more favourable than elsewhere. After the fall of the First World State the European element in this region had dwindled, and the ancient "Indian" and Peruvian stock had come into dominance. Many thousands of years earlier, this race had achieved a primitive civilization of its own. After its ruin at the hands of the Spaniards, it had seemed a broken and negligible thing; yet it had ever kept itself curiously aloof in spirit from its conquerors. Though the two stocks had mingled inextricably, there remained ever in the remoter parts of this continent a way of life which was foreign to the dominant Americanism. Superficially Americanized, it remained fundamentally "Indian" and unintelligible to the rest of the world. Throughout the former civilization this spirit had lain dormant like a seed in winter; but with the return of barbarism it had sprouted, and quietly spread in all directions. From the interaction of this ancient primitive culture and the many other racial elements left over in the continent from the old cosmopolitan civilization, civil life was to begin once more. Thus in a manner the Incas were at last to triumph over their conquerors. Various causes, then, combined in South America, and especially in the new and virgin plains of Patagonia, to bring the First Dark Age to an end." -Last and First Men
[0]: http://gutenberg.net.au/ebooks06/0601101h.html