If x'cracy is a category of governance the rise of democracy must be traced as an evolution of governance systems. If one then were to separate the scope and ends of governance and means of governance and we may get somewhere by tracing these across centuries
If it is important that the manner of alignment of "means and ends" in any X'cracy should be adaptive, democracy possibly does the best job. A correlation between wars and democracy can be investigated from the following of view. How did this war or that catalyse changes or changes in perception of the next improvement that needed to be made in governance? Wars or famines or economic growth may have merely provided the opportunities for conducting "tests of goodness" of the governance system and provided the feedback for re-engineering.
We needn't have a great designers, Blinder watchmakers and tinkerers than Kautilya also may have played their part. Like in biological evolution chance variation may have created partial forms that need some skill of analysis to recognise, in retrospect, as an " evolutionary step". Panchayats or village councils seems to have evolved as local democratic governance devices within one-ruler-or few-ruler'cracies! Their presence has been recorded in the Chola period. Bureaucracy under a largely federal system seems to have played a part in the very slow democratisation of China, but that conclusion is part of a Guide Talk I got for my twenty dollars in the Beijing museum !
It is also possible that democracy may not survive in the same forms. The parliamentary form/degrees of federalism are simply structural parameters that can cahnge from time to time pretty drastically. Look how coalitions have become the new skill to be mastered in the last couple of days.
If the " governance with the consent of the governed" is a defining criterion of democracies rather than forms(" Westminster type parliamentary democracy") or deliverables (" freedoms above everything else") some future situation ,say sever shortage of energy or water, may force people to give "intelligent consent" to technocracy of some sort.
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What would we really want to model? How democracies evolved from older forms of governance or what can make them morph/progress or regress?
Something very simple needs to be abstracted for modelling. Not sure if we are anywhere near.
-ganu
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