I admit that I’m a City Guy. As an adult, I have lived in the heart of five great American urban areas. As I was coming of age in a cozy suburb east of Philadelphia, I felt continually drawn to the city. Averaging perhaps twice a week, I would take the train or the trolley-and-subway combination to Center City and then travel to some of the other great neighborhoods to enjoy movies, concerts, restaurants, poetry readings, plays, sporting events and museums. I considered moving into a new downtown high-rise right after I turned eighteen, but instead chose to live in urban Denver, Colorado, for several years, half a block from the main east-west thoroughfare running through town. The buses came by every six minutes, women dressed in colorful clothing picked up men on the next block over, and sometimes I heard lovers’ quarrels outside my third-floor window....