Back to the subject. Jungle is spot on in this being cyclical. Imperial Spain provides the historical model for comparison. The interesting variable in the USA will center around a culture of ignorance and insecurity and its inability to preserve what western european culture has built in this country. Detroit, central California, Atlanta, etc are excellent examples of what will continue to take place. There is no political solution because it is too far gone. The product of the public education system has reached fruition.
The Count-Duke of Olivares: The Statesman in an Age of Decline by John Huxtable Elliott (Paperback - September 10, 1989)