Don’t be fooled by the news out of Detroit: cities are cool again. One of the big takeaways from the 2010 census was that, after a century-long love affair with suburban subdivisions, affluent Americans are jumping back on the (worldwide) urbanizing bandwagon. For a new generation of hipsters, yuppies and retirees, city living is not only aesthetically and culturally preferable. It is an essential piece of a progressive lifestyle. This sensibility springs from a degree of historical consciousness.