JWSR v10n3-Complete Issue  journal of world-systems research, x, , fall ,  http://jwsr.ucr.edu/ issn 1076–156x © 2004 Christopher Chase-Dunn By Christopher Chase-Dunn Co-Editor Here are three studies of the phe-nomenon of rise and fall in premodern historical systems. In the modern world-system an analogous pro- cess takes the form of the rise and fall of hegemonic core powers, and the arena of contention became global in scope during the 19th century (c.e.). Th e stud- ies here are of three diff erent and largely separate regional world-systems during diff erent time periods. All three focus on state formation, empire building and collapse. Th ompson’s study is one of the fi rst to systematically test for possible causes of the sequence of increasing and then decreasing societal complexity and polit- ical centralization/decentralization in Bronze Age Mesopotamia. He employs the methods of bivariate and multivari- ate time series logit analysis to examine the temporal and causal relationships between urbanization, economic disor- der, trade disruptions, climate change and incursions by peripheral peoples. Wilkinson’s study is one of a series in which he reads standard histories in order to code the power confi guration of interstate systems at ten-year inter- vals. “Power confi guration” codes the degree of centralization of state systems as seven ordinal categories, ranging from total empire to “non-polarity” (no great powers, many small independent states). Wilkinson’s focus in this study is the “Central” system from 1500 to 700 b.c.e. Th e Central system was formed near the beginning of this time period by merger of the formerly separate Egyptian and Mesopotamian state sys- tems.¹ Wilkinson discusses the results of his prodigious coding endeavor in historical and comparative perspective, refl ecting on some of the explanations for the transitions in power confi gura- tion that he fi nds. Kea’s study uses recent archaeo- logical evidence from West Africa to examine the emergence of states and urbanized regions before and during the African Iron Age. His study shows pat- terns of rise and fall, and shifting cen- ters of power within the West African system, and he convincingly makes the case that this regional system played a generative ideological and fi nancial role as it expanded and merged with the Mediterranean system. Premodern Historical Systems: Th e Rise and Fall of States and Empires ¹. Th ese regions had been linked by prestige goods exchanges since before  bce. special section http://jwsr.ucr.edu/ Special Section Introduction