Choose all that apply.

which of the following can contribute to the fall of empires?
economic prosperity
civil war
foreign invasion
natural disasters

All all except for economic prosperity, however, if I were to get edgy about it, economic prosperity, given the situation, could cause an Empire to fall. For example: it could be incentive for a foreign power to invade, if the prosperity is isolated to a few elites, then a revolution could topple the Empire, or the economic prosperity could just be a precursor to an economic disaster.