"...the object of waging a war is always to be in a better position in which to wage another war."

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But the problems of perpetuating a hierarchical society go deeper than this. There are only four ways in which a ruling group can fall from power. Either it is conquered from without, or it governs so inefficiently that the masses are stirred to revolt, or it allows a strong and discontented Middle group to come into being, or it loses its own self-confidence and willingness to govern.

— George Orwell