“…of the largest state in the system~for the entirety of this analysis, the United States! by global GDP in year t, using data compiled in the Penn World Table+ 64 This measure of hegemony, although somewhat crude, is closely related to that used in many previous studies+ 65 Earlier research has found that hegemony influences the formation of IOs as well as patterns of international conflict and cooperation; however, the strength of these relationships remains controversial+ 66 In addition to political factors, we analyze three key aspects of each state's economy+ Past research has linked economic wealth and size to both IO membership rates and democratic transitions, so it is important to control for these factors+ 67 Consequently, we include development, which is country i's per capita GDP in year t, and its gdp in t+ openness is country i's total foreign trade~imports plus Krasner 1976;Russett 1985;McKeown 1991;Busch 1995+ 66+ See Keohane 1984;Martin 1992;andMansfield 1994+ 67+ See Jacobson, Reisinger, andMathers 1986;Burkhart and Lewis-Beck 1994;Shanks, Jacobson, and Kaplan 1996+ exports! divided by its GDP in year t+ There is some evidence that increasing openness increases the propensity for states to join IOs+ 68 Furthermore, because the flow of overseas commerce is affected by the regime types of the trading partners, it is important to ensure that any relationship between democratization and IOs is not an outgrowth of international trade+ 69 We also include a trend~year!…”