Robert Krulwich reminds me of this map tracking dollar-bill movement:

And the thing that strikes me now is that while many of the borders clearly capture commercial/cultural regions, so many of the firmers borders are clearly deliniated by natural formations – the Rockies, the Appalachians, the Mississippi. It it still surprising that these features seem to make as large a difference in our behiavor today as socioeconomic factors.

Advertisements