This paper explores the role of agriculture in the development of the capitalist world economy, and in the trajectory of the state system. At present, when food security and foreign debt command policy attention, it is useful to examine the assumptions behind attempts to build up national agricultures in Third World countries. We maintain that these assumptions, when considered from a world-historical perspective, have certain shortcomings in theory and real obstacles in practice. Our argument is that contrary to the prevailing development model of the ideal national economy in which agriculture and industry complement one another dynamically (Rostow 1960;Johnston & Kilby 1975;Senghaas 1988), the historical relations between 'agriculture' and 'industry' have been rather more fluid and global in scope.The very distinction between advanced capitalist and underdeveloped or peripheral economies assumes that the former, in contrast to the latter, are articulated, that is, the main growth dynamic derives from intersectoral exchanges within the national economy (Amin 1974; de Janvry 1981). We argue, however, that this unexamined assumption applies possibly to one nation-state only, and then only for a brief historical period in a context of growing transnational capital movement that has increasingly precluded the model's extension to other countries. This case is the United States, in which agriculture was a source of demand for domestic industry during the period of protectionism accompanying late nineteenth century British hegemony and its decline through to the end of the Second World War. Yet even then US agriculture was principally export-oriented. The ideal of national inter-sectoral balance nevertheless stems from this historical conjuncture, and gained currency with the rise of American hegemony and the proliferation of modernization and dependency theories that generalized the American model.Our goal, then, is to reconstruct a preliminary history of agriculture to shed light on its impact on the state system, and thereby to offer a critique