Perhaps, then, we should think of the ruins of Detroit as our Roman Forum. Just as Rome's triumphal arches still remind us of its bygone imperial victories in Mesopotamia, Persia, and elsewhere, so Motown's dilapidated buildings today invoke America's fast slipping supremacy.
Among the most imposing is Henry Ford's Highland Park factory, shuttered since the late 1950s. Dubbed the Crystal Palace for its floor to ceiling glass walls, it was here that Ford perfected assembly-line production, building up to 9,000 Model Ts a day - a million by 1915 - catapulting the United States light-years ahead of industrial Europe.
It was also here that Ford first paid his workers five dollars a day, creating one of the fastest growing and most prosperous working-class neighborhoods in all of America, filled with fine arts-and-crafts style homes. Today, Highland Park looks like a war zone, its streets covered with shattered glass and lined with burnt-out houses. More than 30% of its population lives in poverty, and you don't want to know the unemployment numbers (more than 20%) or the median yearly income (less than $20,000).
There is one reminder that it wasn't always so. A small historical-register plaque outside the Ford factory reads: "Mass production soon moved from here to all phases of American industry and set the pattern of abundance for 20th Century living."