Book excerpt: Despite public support for the death penalty, a remarkable number of countries in different parts of the world have banned capital punishment in all its forms, regardless of the nature of the crime or the criminal. Arguing that international norms are often a critical source of ideas for change in state policy, but that impact varies greatly, Sangmin Bae offers a systemic explanation of how, when, and under what conditions a country complies with international norms. She examines four countries that reached different stages of norm compliance with respect to the death penalty—Ukraine, South Africa, South Korea, and the United States. Focusing on the role of political leadership and domestic political institutions, Bae clarifies the causal mechanisms that lead to state compliance or noncompliance with the norm.