The Politics of Immigration: Partisanship, Demographic Change, and American National IdentityImmigration has been deeply woven into the fabric of American nation building since the founding of the Republic. Indeed, immigrants have played an integral role in American history, but they are also intricately tied to America's present and will feature prominently in America's future. Immigration can shape a nation. Consequently, immigration policy can maintain, replenish, and even reshape it. Immigration policy debates are thus seldom just about