Despite the prevalence of armed groups in world politics, a prominent measurement
challenge obscures understanding about many of these militant actors, especially when …

States around the world are fortifying their international borders at unprecedented rates.
While only seven states had fortified their borders with walls or fences as of the end of World …

What, if any, effect do physical barriers have on cross-border population movements? The
foundational claim that barriers reduce migration flows remains unsupported. We …

This article analyzes the efficacy of border enforcement against smuggling. We argue that
walls, fences, patrols, and other efforts to secure porous borders can reduce smuggling, but …

Over the last decade, there has been a notable surge in the movement of refugees across
international borders, posing significant challenges for the international community. In …

This study assesses the impact of international border walls on evaluations of countries and
on beliefs about bilateral relationships between states. Using a short video, we …

To strengthen border patrol measures, unmanned aerial vehicles (UAVs) are gradually used
in many countries to detect illegal entries on borders. However, how to efficiently deploy …

Where cross‐border sanctuaries enable rebels to marshal external support, classical
theories of counterinsurgency extol the strategic value of border fortification. By sealing …

In a world of accelerated movements, this article examines how infrastructures matter in
international relations. We first show that the International Relations (IR) discipline has …

Governments build walls to curtail a range of illicit activities like immigration, crime, and
terrorism. We argue that while physical barriers effectively prevent specific unwanted …