International migration is a central aspect of globalization in the contemporary world and is recasting states and societies in a range of distinctive and important ways. The updated and extensively revised third edition of this text provides up-to-date coverage of the nature, extent and dimensions of international population movements and of their consequences in an increasingly multicultural world. An entirely new chapter addresses the problems of regulating migration at both state and regional levels, including the security implications in the context of September 11 and the "war on terrorism".