Succes of early people

Succes of early people was relly impressive considering that there was an Ice Age.However about 15 000 years ago,climate started to change to better and Ice plates started to melt.Face of earth started to change while plants and animals spreaded to areas that were empty till then and human society started to experiment with new ways of life.In next couple of thousand of years on Middle East,in north China,Mexico and Peru small landworking villages appeared.This way of life quickly spreaded to close areas.From that we can conclude that the basis of human life was landwork,not haunting and collecting.That was the basic change that had drastic and irreversible consequences like : Development of cities,the invention of letters and birth of history.