Abstract
National Governments and international organizations have been concerned in the last decades of the twentieth century by birth control in third world countries due to alleged overcrowding. Paradoxically, during the nineteenth century the rulers of the new American republics lived obsessed with increasing population of these countries. which was what energized population growth in these regions of the world and especially in the Isthmus of Tehuantepec? on start-up of the independent Mexico, large tracts of our land were depopulated, and governments in turn tried to resolve it through colonization projects.