Doug Casey makes the case that history is repeating itself. From Casey at internationalman.com:

Despite all our similarities with Rome, and even equipped with our understanding of why Rome collapsed, we can’t avoid Rome’s fate just by trying to avoid Rome’s mistakes. Yes, we have an analogue of early Christianity chewing away at our civilization’s foundations. And yes, we have a virtual barbarian invasion to contend with. But there’s another factor, I think, that worked against the Romans and is working against us… one Gibbon didn’t consider.
We can’t evade the second law of thermodynamics, which holds that entropy conquers everything and that over time all systems degrade and wind down. And that the more complex a system becomes, the more energy it takes to maintain it. The larger and more complex, interconnected, and interdependent it becomes, the more prone it is to breakdown and catastrophic failure. That includes countries and civilizations.
The Romans reached their physical limits within the confines of their scientific, engineering, economic, and other areas of knowledge. And the moral values of their civilization, their founding philosophies, were washed away by a new religion. We may reach our technological limits. And our founding values are certainly being washed away.
Our scientific knowledge is still compounding rapidly—because more scientists and engineers are alive today than have lived in the previous history of mankind put together. That statement has been true for at least the last 200 years—and it’s been a gigantic advantage we’ve had over the Romans. But it may stop being true in the next few generations as the population levels off and then declines, as is happening in Japan, Europe, China, and most of the developed world. It’s compounded by the fact that U.S. universities aren’t graduating Ph.D.s in engineering, mathematics, and physics so much as in gender studies, sociology, English, and J.D.s in law. As it degrades, the U.S. will not only draw in fewer enterprising foreigners, it will export its more competent natives.
Rome lasted 1000 years and then had a part II with the Byzantine Empire.
FUSA will be lucky to make it to 250.
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