Under the North American Free Trade Agreement (NAFTA), certain citizens of Canada and Mexico are eligible to enter the U.S. under the nonimmigrant TN status. The TN Visa enables Canadian and Mexican citizens to temporarily work in U.S. in a NAFTA-approved professional occupation. TN status can be granted for a period of one year. TN status can be renewed annually, as long as the applicant can show that the proposed stay continues to be of a temporary nature.