Advertisement On November 20, 2017, United States Citizenship and Immigration Services (USCIS) issued a policy memorandum clarifying that the TN definition of “economists.” Background On December 17, 1992, the presidents of the United States and Mexico, and the prime minister of Canada entered into the North American Free Trade Agreement (NAFTA). NAFTA created “special economic and trade … Continue reading USCIS Issues Guidance on TN Nonimmigrant Status for Economists