Where's George? Researchers follow the money to define communities in US

When travel was local, borders and communities were easy to define, but now our connectivity is more complex. Researchers have taken a look at human mobility and redrawn the borders within the United States, showing the country's most connected areas. Some of the borders in this new map are familiar, but many are not. They used data generated by wheresgeorge.com, a website that tracks dollar bills spent across the country.

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