The North American Free Trade Agreement (NAFTA) created special economic and trade relationships for the United States, Canada and Mexico and authorized nonimmigrant NAFTA Professional (TN) visas for citizens of Canada and Mexico to work in the United States as NAFTA professionals. This visa status is available only for specific professional occupations and only to citizens of Mexico and Canada.
TN visas are issued for three years, and can be renewed. An advantage of both the TN visa is that an application can be made at the port of entry or consulate rather than with the U.S. Citizenship and Immigration Services. This can save time and money when you need to hire a worker quickly.