Immigration regulation in federal states : challenges and responses in comparative perspective The book examines the phenomenon of immigration federalism: its main characteristics why and how it has developed its implications for immigration systems (in general) and non citizens rights (in particular). The book introduces the reader to theoretical perspectives on immigration federalism through three sets of literature federalism governance and non citizens rights that provide a necessary framework for understanding immigration federalisms multiple facets and impacts. It also offers an analysis of immigration federalism through case studies of six jurisdictions: Australia Canada Germany Switzerland the EU and the US. Despite increased sub national activity in immigration regulation in several federal states very little research has been dedicated so far to comparing how federal states deal with immigration federalism. Comparative studies on the human rights implications of immigration federalism have received even less attention. This book seeks to fill the gap in this area and is an important contribution to the field providing the reader with a better understanding of the complex issues surrounding immigration federalism and its impact on non citizens