Do states have the right to prevent potential immigrants from crossing their borders, or should people have the freedom to migrate and settle wherever they wish? Christopher Heath Wellman and Phillip Cole develop and defend opposing answers to this timely and important question...In addition to engaging with each other's arguments, Wellman and Cole address a range of central questions and prominent positions on this topic. The authors therefore provide a critical overview of the major contributions to the ethics of migration, as well as developing original, provocative postitions of their own.