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According to G. Childe, the history of mankind is dominated by two great revolutions: the invention of agriculture and the birth of cities. From the same socio-historical point of view, R. Redfield is inclined to think that the consequences of the invention of agriculture have been less decisive than the urban revolution. Hence, he is led to classify all civilisations in two categories: the ‘pre-urban’, and those that have known a greater or lesser urban development.