The U.S. Supreme Court typically rules on cases that present complex legal questions. Given the challenging nature of its cases and the popular view that the Court is divided along ideological lines, it's commonly assumed that the Court routinely hands down equally-divided decisions. Yet the justices actually issue unanimous decisions in approximately one third of the cases they decide. Drawing on data from the U.S. Supreme Court database, internal court documents, and the justices' private papers, The Puzzle of Unanimity provides the first comprehensive account of how the Court...