The article takes up the issue of contemporary Mexican migration to the United States of America. Some crucial information is supplied concerning the scale and dynamism as well as the historical and social context of this phenomenon. It also outlines the key problems connected with the application of adequate theoretical models that would facilitate the analysis of migration as such and other related processes like integration with the American society. The text is an introduction to the broad multi-aspect issue of the presence of Mexican immigrants in the USA, also in the context of other people of Latin American origin. .