Mapping the westward-shifting center of the US population is nothing new, see for example Population Drift from 2011. But how about the changing spatial distribution of the 10 largest US cities (by population) over time? Keir Clarke has a nice post on that over at Maps Mania and created Shifting Cities. A Historical Look At America's Largest Cities is a similar interactive map (using Tableau) and below is a simpler version as an animated GIF.
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| http://imgur.com/tWE7i |
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