Urban areas like Portland are sorting themselves, with young people who like the New Urban lifestyle moving to city centers and families with children moving to the suburbs. People have noticed other sorts across the country, such as blue cities and red rural areas.
Someone has written a book about this titled The Big Sort: Why the Clustering of Like-Minded America Is Tearing Us Apart. This sorting, says co-author Bill Bishop, is happening at a neighborhood level, and one of the problems is that many people rarely encounter or talk with people who have different histories, lifestyles, or political views. I confess I haven’t actually read this book yet, but I’ve ordered it and will do so as soon as it arrives.