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The goal of this dissertation is to inquire into how states balance economic motivations and security concerns when pursuing sovereignty at borders. More precisely, the dissertation examines tradeoffs between interdependence sovereignty-control over transborder flows--and Westphalian sovereignty defined as exclusion of external actors from states' authoritative space. Focusing on control over cross-border human mobility as the issue area, I put forward the securitized interdependence framework as a theory that encompasses economic and security logics of policy-making. Because migration control rests at the nexus of economic/material and geopolitical/military dimensions of state security, it provides an ideal testing ground for observing the interaction of economic and security motives. The theoretical framework draws on the literature on complex interdependence and the logic of the trading state to postulate empirically verifiable propositions on migration control policies.