Immigration promises to be a key issue in the U.S. Presidential elections. Candidates from both parties favor limits but differ on the extent of restrictions. Immigration is important for a vibrant economy in a country with a low rate of native population growth. What role has immigration played in U.S. economic and demographic growth in recent decades? What has been the impact, if any, on employment and wages among the native-born? What are the likely impacts of restricting immigration for p...