| Résumé: | During the third decade of this century Mexican geographical structure began to change notoriously. Due to the strong influence of North American economy, the north of Mexico became progressively one of the most important regions in the country, with the emergence of favorable perspectives of economic growth. Soon it became attractive to migration from the demographically pressed regions of Central Mexico. Thus, the north of Mexico was favored by the presence of qualified workers and a growing population. However, the region was not evenly populated, due to geographic, historic, and socio-economic factors that hue and diversify even the processes of migration and settlement. Some regions present important changes in their migratory flow, evidenced by the presence of new entities of origin and the disappearance of others. This situation is clearly observed in the period between 1930 and 1990, which exhibits socio-economic conditions of evident effect and full temporal coincidence.
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