This is a good read on both the history and the current role of nation-states in the ways of the world. I’d have appreciated a paragraph or two on the economic benefits of subnational currencies, even local ones. The concentration of development, industry, knowledge, and wealth in just a few cities derives in large part from the lack of exchange-rate balancing between different regions and cities within nation-states. I’ve actually put time and thought into a fictional world in which there are no countries as such, but other groups reflecting affinity and allegiance at multiple scales. Alas, fiction is not a terribly useful guide to real-world policy.