For all of these reasons, systems starting from a similar base will come to have unique individual characteristics based on their specific histories. Science can describe and often explain the behavior and evolution of a complex adaptive system, but cannot predict it. Oftentimes, however, the chain of events is so subtle and convoluted, and the evidence so fragmentary, that the sequence of events and the web of causation can never be satisfactorily understood, even in retrospect. The reason we dwell on the complex adaptive system is that it provides so much insight into human political constructs. Any group of humans who interact will, over time, form a unique system broadly similar to the ones we have described.
Humans build all sorts of social structures and engage in complex behavior.
Human structures include families, tribes, clans, social classes and castes, secret societies, street gangs, armies, feudal hierarchies, commercial corporations, church congregations, political parties, bureaucracies, criminal mafias, states of various kinds, alliances, confederations, and empires. These structures participate in separate but thoroughly intertwined networks we call social, economic, and political systems. Those networks produce markets, elections, and wars. And, though we tend to associate war with the state, in fact all of the structures we have listed have been known to engage in warfare. Such networks and structures create their own rules, and are thus fundamentally unpredictable.