For thousands years they settled on entire continent and somewhere by 9000. The hunting tribes, which by small groups passed to another continent in search of the output, were, apparently, the trailblazers of America. This isthmus existed during the last glacial period, when in the enormous polar caps this quantity of water was forged by ice, that the level of world ocean was considerably lower than now. Approximately 40 thousand years ago of men it settled on all remaining inhabited earth of planet therefore it is completely probable that at the same time it moved also through the isthmus, which still connected up that time Siberia and Alaska. In spite of all efforts of archaeologists, cannot be more accurately dated this event. The first Americans, apparently, arrived to the continent from Asia of 20-40 thousand years ago. However, they created civilization with the enormous cities and achieved the salient successes in the skill and the sciences. The ancient peoples of America were developed almost in the complete isolation from the remaining peace and, in particular, for this reason they made comparatively few technical discoveries. Civilizations of central and South America
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