The continued failure to devise and implement a sound and sustainable immigration policy weakens America's economy and threatens its national security. Many prominent economists believe that the United States needs a profound change in its immigration laws and practices. This volume tackles the issues of legal and illegal immigration in a rigorous manner using econometrics analysis and provides clear policy recommendations. Topics discussed also include outsourcing in a context of unionized oligopoly. The author's empirical evidence demonstrates that large scale amnesties that provide legal status for illegal immigrants should be avoided, as they create unhealthy stimulus for future illegal immigration. The empirical evidence presented also suggests that recent legal immigrants from Mexico facilitate the flow of illegal migrants from Mexico. With respect to legal immigration, the author shows that higher index of Economic Freedom is associated with increased migration flows. The book will be found highly illuminating to immigration theorists and practitioners as well as to students and researchers interested in immigration and outsourcing.