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A description of how these colonias typically evolve is here in a discussion of their encroachment in the Oaxaca Valley:
"Colonias tend to follow a basic developmental pattern. Once about ten families have settled in a given spot household heads gather to demand the basic services of water and electricity. In the meantime they live in wretched conditions: without electricity, on dirt streets with no sanitation or sewers, walking long distances to find potable water. The irregular status of the settlement means they have no direct access to public transport or services such as vaccination campaigns and other health programs. During a second phase, which may take years to emerge, residents begin to pressure for other services: schools, sewage, transportation, paved streets. Higgins labels these "mature colonias" (Higgins 1974) and notes they usually are associated with a process of housing improvements such as concrete roofs, brick walls, and more sturdy construction. Even so these improvements basically reflect do-it-yourself construction without regard to formal plans or regulations.
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"As for the families who create the colonias, it is obvious that one commonality is that they are poor migrants arriving from elsewhere. Nevertheless they are not all peasants from rural indigenous communities who have come to the city in search of work, as was the case in 1878 (Yescas Peralta 1958: 779). Today the majority are families from towns across the state (Rees, et al 1991) who have lived as renters for some time in the city of Oaxaca. Having accumulated some capital (Butterworth 1973: 220) and finding the cost of housing in the city center prohibitive, they opt to move to a nearby suburban area where they can purchase a low-cost lot and have the possibility of a home through owner-built construction. Land on the slopes of Monte Alban fits this need, for as ejidal or communal lands no longer in use those holding the use rights prefer to subdivide and sell parcels cheaply to low-income people who will not demand formal title."
So the form of governance, as well as culture, has a major impact on how sustainable land use happens, and how the preservation of the existing natural environment must be undertaken. In this country, it will necessarily involve radical land use reform as well as providing affordable living spaces in the urban areas for people who don't own property.