Is empire cyclical, doomed to birth, consummation, establishment, decline and desolation? Or are there other futures for large regimes? Can large complex systems create new kinds of future, or are the winds of fate far too strong? Can we predict decline, change it, improve things, create order out of chaos?
Nobody is better at exploring the large questions than Niall Ferguson. This lecture is long and well-considered, not a candidate for viral videohood. Given the subject, that is perfect.