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(this is also how corporate empires fall -- IBM and the rise of personal computing, Microsoft and the rise of the web and then mobile...)
2) Decadence -- gradual loss of the infrastructure or know-how that allowed the empire to expand (historically, often a communication and transportation network that enabled supervisor military command & control)
3) Internal Strife -- for example the empires of Alexander and Genghis Khan quickly disintegrating into competing factions during succession wars
4) The Hammer of Fate -- pandemics, earthquakes, fires, volcanic eruptions... In particular, plagues that wipe out 20-50% of the population seem to be a common fixture of the fall of great empires, acting as a trigger or a compounding factor
That "supervisor" should be "superior" (damn autocorrect)
And yet I wonder if you would be able to give some examples from history, for a decadence defined this way.
Decadence ought to include social corruption... e.g., the rise of a powerful rentier class.
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