In Peru then, and in Mexico, two nearly parallel centers of civilization grew up during thousands of years; sprung from the same foundation, differentiated in their superstructures, that of Mexico evidently the earlier, and, at the time of discovery, slightly more advanced. The Peruvian civilization, if we include with it those of western Colombia and Bolivia, rayed itself out through the whole southern continent, becoming feebler and more abbreviated with increasing distance from its focus.