Still reading it actually, but definitely "The Sovereign Individual: Mastering the transition to the information age" by James Davidson and William Rees-Mogg (actually the father of current UK politician Jacob Rees-Mogg)

Its main thesis is that the main driver of megapolitical change are shifts in the risk/reward payoffs of violence. Was written in '97 but still talks about cryptocurrency and things like that. Interesting book.