This paper has two closely related purposes, both of which, if accomplished, may help to accelerate the development of international relations as an empirically based discipline. One is to identify the shifting and expanding membership of the international system during the 125 years between the end of the Napoleonic Wars and the outbreak of World War II. The other is to classify all such members of the system according to their attributed importance or status during the same period. In each case, the intent is not only to provide certain data which may be useful to the discipline, but to describe in considerable detail the procedures by which such data were gathered or, more accurately, “made.”
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