1. Introduction: puzzling trends in waves of contention 2. A new theory of political diffusion: cognitive heuristics and organizational development 3. Organizational development and changing modes of democratic contention 4. The tsunami of 1848: precipitous diffusion in inchoate societies 5. The delayed wave of 1917-19: organizational leaders as guides of targeted contention 6. The slow but potent 'third wave' in South America: the prevalence of negotiated transitions 7. Crosscurrents of the third wave: inter-organizational competition and negotiation in Chile 8. Theoretical conclusions and comparative perspectives.
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