Abstract
Most pristine states formed in the context of competing chiefdoms, when one of the latter succeeded in incorporating its rivals into a larger polity. Some of the processes evident during state formation include chiefly cycling, biased transmission, territorial expansion, and the gaining of competitive advantage. In some archaeological circles, however, it has become fashionable to reject ecological, demographic, and technological processes, and seek agent-based or ideological explanations for state formation. This essay, delivered as the tenth McDonald Lecture, examines five agents who modified ideologies and created states from chiefdoms. It concludes that process and agency are complementary, rather than antithetical, perspectives; thus the latter is unlikely to make the former obsolete.

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