How migration policies moderate the diffusion of terrorism

There is an ongoing debate among practitioners and scholars about the security consequences of transnational migration. Yet, existing work has not yet fully taken into account the policy instruments states have at their disposal to mitigate these risks, and we lack reliable evidence for the effectiveness of such measures. The following research addresses both shortcomings as we analyze whether and to what extent national migration policies affect the diffusion of terrorism via population movements. Spatial analyses report robust support for a moderating influence of states’ policies: while terrorism can travel from one country to another via larger migration populations, this only applies to target countries with extremely lax regulations and control mechanisms. This research sheds new light on the security implications of population movements, and it crucially adds to our understanding of governments’ instruments for addressing migration challenges as well as their effectiveness.