This book examines the relationship between illegal migration and globalization. Under the pressures of globalizing forces, migration law is transformed into the last bastion of sovereignty. This explains the worldwide crackdown on extra-legal migration and informs the shape this crackdown is taking. It also means that migration law reflects key facets of globalization and addresses the central debates of globalization theory. This book looks at various migration law settings, asserting that differing but related globalization effects are discernible at each location. The 'core samples' interrogated in the book are drawn from refugee law, illegal labor migration, human trafficking, security issues in migration law, and citizenship law. Special attention is paid to the roles played by the European Union and the United States in setting the terms of global engagement. The book's conclusion considers what the rule of law contributes to transformed migration law.