Explaining Commitment: States and the Convention against Torture

Why do states commit to international human rights treaties that may limit state sovereignty? Existing arguments focus on either the fear of domestic democratic instability or on international norms. We focus instead on the variation in three kinds of costs that states must pay to commit: policy change, unintended consequences, and limited flexibility. We use a discrete time-duration model to test all of these explanations on state commitment to the international Convention Against Torture, one of the most important international human rights treaties. We find strong evidence for the importance of norms and all three types of costs, but no evidence supporting state desires to lock in the benefits of democracy in the face of domestic democratic instability.