It is true that the top quintile is getting richer while the bottom is getting poorer, but the bottom is not the same people. There is, fortunately, a constant churning at the bottom as new immigrants move in and those who used to be on the bottom begin their long, thrilling upward climb to the American dream.
It is an impressive place that smells like the 1950s, when everyone wore starch white shirts and black slacks and perfect crewcuts and worked on massive industrial projects