In this article we report an inventory of cycles, upward sweeps and collapses of polity sizes in five separate interpolity systems: Mesopotamia, Egypt, South Asia, East Asia and the expanding Central System that eventually became the contemporary global system. Upward sweeps are defined as instances in which the largest sovereign polity in a network of fighting and allying polities significantly increases in size. Collapses are instances in which the size of the largest polity greatly decreases and stays down for a significant period of time (centuries). We use regional interpolity systems rather than single polities as the unit of analysis, following the comparative world-systems framework. We are limited to those regions and time periods for which quantitative estimates of largest polity sizes are available. We compare the frequencies of cycles and sweeps across five interpolity networks, and find more similarities than differences across the five systems. This is somewhat surprising because most studies that compare East Asia with the West stress important differences. We find a total of 22 upsweeps and 19 downsweeps across the five systems, but only three instances of prolonged system-wide collapse. We also find that the frequency of cycles increased over the long run, while the frequencies of upsweeps and downsweeps did not display long-term trends. The lack of a downward trend in downsweeps challenges the supposition that resilience grows with sociocultural complexity and size.This article reports some of the results from a research project on the growth of settlements and polities in regional world-systems since the Stone Age. 1 The larger project uses both quantitative estimates of the population sizes of the largest settlements in world regions as well as estimates of
This is a study of the growth and decline of cities for the purpose of identifying those events in which they significantly increased in size. Significant changes in the scale of cities are important for understanding the long-term trend toward more complex and hierarchical human societies. We report the results of an inventory of cycles, upsweeps, and collapses of settlements in five separate interpolity systems. Upsweeps are instances in which the largest settlement in a world system significantly increases in size. Collapses occur when the size of the largest settlement greatly decreases and stays down for a significant period of time rather than rebounding. We use regional interpolity systems (world systems) rather than single polities or settlements as our unit of analysis. Because the accurate designation of sweeps requires interval scale measures, we are limited to those regions and time periods for which quantitative estimates of largest settlement sizes are regularly available. We find a total of 18 upsweeps and five downsweeps, and only two instances of prolonged systemwide settlement collapse. We also investigate whether or not the rate of cycles has increased over the long run, and we find that cycles of city growth and decline have not accelerated. We also find a greater rate of urban cycles in the Western (Central) System than in the East Asian System, which supports the usual notion that the Western city system was less stable than the Eastern city system.
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