The two-volume is organized around a series of four dozen in-depth essays on specific aspects of American immigration history since the founding of the Republic. This encyclopedia addresses the major historical themes and contemporary research trends related to U.S. immigration, canvassing all the major policy endeavors on immigration in the last two centuries. In addition to documenting immigration policy, the contributors devote extensive attention to the historiography of immigration, supplementing theories with cutting-edge sociological data. Not content with providing a comprehensive overview of immigration history, however, the work also offers probing investigations of key figures behind the ideas that have shaped the nation's self-understanding. Taken as a whole, this seminal work lifts out the personalities and policies that surround the composition of America's national identity, illuminating the past as a series of lessons for the future.