The Immigration and Nationality Act (INA) specifies a complex set of numerical limits and preference categories that include economic priorities among the criteria for admission. The INA allocates 140,000 visas annually for employment-based legal permanent residents (LPRs), and they were 14.2% of the total 1.0 million LPRs in 2010. The INA further specifies that each year, countries are held to a numerical limit of 7% of the world-wide level of U.S. immigrant admissions, known as per-country limits or country caps. Even as U.S. unemployment levels remain high, some employers assert that they...