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Ch 8 of Hendrik Spruyt, The Sovereign State and Its Competitors: An Analysis of Systems Change (Princeton University Press, 1994)
Sovereign states triumphed over city-leagues and city-states because their centralized structure strengthened both internal economic development and external relations while other institutional structures struggled with standardization and defections, leading to the selection of sovereign (territorial) states via competitive pressure and mutual empowerment.
Notes for Pomona class Poli 005: Intro to Comparative Politics