The attention devoted to the unprecedented levels of imprisonment in the United States obscure an obvious but understudied aspect of criminal justice: there is no consistent punishment policy across the U.S. It is up to individual states to administer their criminal justice systems, and the differences among them are vast. For example, while some states enforce mandatory minimum sentencing, some even implementing harsh and degrading practices, others rely on community sanctions. What accounts for these differences?

The Politics of Imprisonment seeks to document and explain...