Fascinating picture! Without reading the article, my first though is what about self selected migration of the healthy? Or not even the healthy, but rather those with the ability to pay for better medical care...or, gulp, insurance? At least the counties in Michigan appear to be counties with high levels of out migration, but I don't know if that story would hold in the south.
Yeah, these are really good questions. It would be interesting to compare this map to one showing emigration by county over the same time period. Also, CBTheo, are you totally not surprised by these results?:
International development, economics and some pretty ambitious ideas from a stubborn graduate student clinging to her sense of adventure.
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