This introductory article defines the concept of transnationalism, provides a typology of this heterogeneous set of activities, and reviews some of the pitfalls in establishing and validating the topic as a novel research field. A set of guidelines to orient research in this field is presented and justified. Instances of immigrant political and economic transnationalism have existed in the past. We review some of the most prominent examples, but point to the distinct features that make the contemporary emergence of these activities across multiple national borders worthy of attention. The contents of this Special Issue and their bearing on the present understanding of this phenomenon and its practical implications are summarized.
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