Many generations before that, again possibly centuries, the founders of this community, abandoning the primitive pueblos of their people elsewhere, had sought new homes in the valleys tributary to the Mancos River. Perhaps they were enterprising young men and women dissatisfied with the poor and unprogressive life at home. Perhaps they were dissenters from ancient religious forms, outcasts and pilgrims, for there is abundant evidence that the prehistoric sun-worshippers of our southwest were deeply religious, and human nature is the same under skins of all colors in every land and age. More likely they were merely thrifty pioneers attracted to the green cedar-grown mesas by the hope of better conditions. Whatever the reason for their pilgrimage, it is a fair inference that, like our own Pilgrim Fathers, they were sturdy of body and progressive of spirit, for they had a culture which their descendants carried beyond that of other tribes and communities of prehistoric people in America north of the land of the Aztecs. Beginning with modest stone structures of the usual cliff-dwellers' type built in deep clefts in the mesa's perpendicular cliff, safe from enemies above and below, these enterprising people developed in time a complicated architecture of a high order; they advanced the arts beyond the practice of their forefathers and their neighbors; they herded cattle upon the mesas; they raised corn and melons in clearings in the forests, and watered their crops in the dry seasons by means of simple irrigation systems as soundly scientific, so far as they went, as those of to-day; outgrowing their cliff homes, they invaded the neighboring mesas, where they built pueblos and more ambitious structures. Then, apparently suddenly, for they left behind them many of their household goods, and left unfinished an elaborate temple to their god, the sun, they vanished. There is no clew to the reason or the manner of their going. Meantime European civilization was pushing in all directions. Columbus discovered America; De Soto explored the southeast and ascended the Mississippi; Cortez pushed into Mexico and conquered the Aztecs; Spanish priests carried the gospel north and west from the Antilles to the continent; Raleigh sent explorers to Virginia; the Pilgrim Fathers landed in Massachusetts; the white man pushed the Indian aside, and at last the European pioneer sought a precarious living on the sands of the southwest.