How is the U.S. actually split geographically?

US regions, based on commutes
US regions, based on commutes

When we think about where we live, usually our ideas start with political boundaries—we’d say we live in a particular state, city, or town. Ask about a neighborhood, sports team loyalties, or regions not defined by borders, though, and it might get a little fuzzier. In densely settled places like the East Coast, sprawl can make it hard to draw lines around places, too. Where in New Jersey does the New York City region end and the Philadelphia region begin?

These larger urban areas are sometimes called “megaregions,” and in a new paper, published in PLOS ONE, Garrett Dash Nelson, a historical geographer from Dartmouth, and Alasdair Rae, an urban analyst from the University of Sheffield, teamed up to identify them across the United States, using commuting data and a computational algorithm.

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