David Johnson posted: > "As my stories all have a political and social slant instead of a > physical-science slant, I think the one author who influenced me most > was Nicco Machiavelli, with H. L. Mencken placing and Karl von > Clausewitz showing." - H. Beam Piper, "Double: Bill Symposium" > interview [1] https://en.wikipedia.org/wiki/Ibn_Khaldun for collapses of empires