The marginality in countries not developed and in Latin America for the Decade of the 1950s had just 16 cities in countries in developing with an urban population of more than 200 million inhabitants. But already the 1980s there were more than 60 cities and for the year 2000 had exceeded the 200 cities with an urban population of approximately 2,000 million inhabitants, but the most serious problem with his belt of misery (Ascanio, 1983). All these demographic changes have created new and dramatic difficulties both for the own inhabitant that has that incorporated in marginal areas, for resources in the rural or urban environment, which are subject to pressures unprecedented by a mass of inhabitants anarchic and disorganized. Several authors who have researched the cases of urban marginality insist the peculiar character of the excluded in Latin America. It has pointed out that in these countries there is a cultural overlay, a situation of dependence, an unusual demographic growth and the relationship of these Nations with their developed neighbors. However, it has been said that these characteristics also existed in countries which began their development, which showed population excluded and unemployed, including also the massive migration to the cities, which moved the rural marginalization to the areas urban, with all its shortcomings of participation. Perhaps the difference of marginality in Latin America due to structural causes, especially to an unequal distribution of wealth and opportunities, and also to the demographic pattern that was accentuated to be a region that in addition to its rural exodus, served as host to European populations, which moved towards that new countries partly after the crisis of the wars they would absorb the potential marginalization of these human flows. Latin America to accept technologies that came from developed countries and having a very depressed industrialization, could not absorb enough labor as it was expected; i.e.