Collaboration can be a painful process, especially between authors of different disciplines. This book is an outgrowth of discussions between a Political Scientist and Economists at the School of Urban and Public Affairs, University of Louisville. The Economics perspective is found in Chapter 3 and was largely written by Frank Götzke. The Political Science oriented review, Chapters 2 and 6,aswellasall the case studies were largely provided by Steven Koven. Most of the book, but es- cially Chapters 4, 5, and 7 evolved as a consequence of conversations between the two authors. We believe the product of two disciplinary approaches has produced a collective outcome that is