When Law Deters and When It Provokes Force in Territorial Disputes

Why International Law Shapes the Use of Force?

Paul Huth, Sarah Croco, and Benjamin Appel ask how international law influences leaders' decisions to use military force in territorial disputes. The authors focus on whether legal doctrines create a clear focal point—an unambiguous legal cue that favors one side—and how that cue changes incentives for restraint, negotiation, or escalation across different stages of conflict.

How Legal Focal Points Work

The paper develops a simple, stage-based theory. When legal principles produce a focal point that clearly favors one claimant, that state should be less likely to initiate force and more likely to pursue negotiations when considering an initial challenge to the status quo. By contrast, once a dispute becomes militarized, the authors argue the logic reverses: the state with the legal advantage has stronger incentives to escalate military force, using its legal claim to justify and press coercive actions.

Statistical Tests of Territorial Disputes

Huth, Croco, and Appel evaluate these expectations using a series of statistical tests applied to data on territorial disputes and militarized interactions. The empirical strategy compares behavior across dispute stages to isolate whether the presence of a legal focal point and legal advantage predict different choices about initiating force or escalating once combat begins.

What They Found

• Strong empirical support for the core theoretical claim: legal focal points reduce the probability that the favored state will initiate force in an initial challenge.
• Once disputes become militarized, having the legal advantage is associated with a higher probability that the advantaged state will escalate the level of military force.
• The effect of law therefore depends on the conflict stage: law can act as a coordination mechanism that deters early violence but can also embolden legally advantaged actors during ongoing confrontations.

What This Means for World Politics

The findings suggest international law operates not merely as a moral or normative backdrop but as a strategic tool that shapes bargaining and coercion. For scholars and policymakers, the study highlights that legal clarity can both stabilize peaceful outcomes before violence begins and, paradoxically, increase the risk of escalation once fighting starts—so understanding the legal context matters for predicting state behavior and designing conflict management strategies.