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We review and analyze some recent research on regionalism. We begin by discussing how various studies have defined regions and regionalism. Because much of the work has been conducted by economists, we then turn to a summary of the economics of regionalism. However, it is widely held that economic factors alone are insufficient to explain regionalism's causes and consequences and that political factors are centrally important. We analyze how domestic and international political factors have guided both economic regionalism and security regionalism. We conclude by outlining some avenues for future research, placing particular emphasis on the need to better integrate insights from political economy and international security in the study of regionalism. Copyright © 2010 by Annual Reviews. All rights reserved.

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