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Look at the first derivative of your data. As the area grows more affluent, (with about a 25 year or so lag) the birthrate starts a sharp drop, eventually in 25-50 years to below replacement. it's happening in Mexico right now. In another 20-25 years, illegal immigration will become a thing of the past, due to reduction in population pressure. (And when I say affluent, I mean the general populace, not a narrow elite at the top growing richer.)
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