【正确答案】正确答案：North American Free Trade Agreement (NAFTA) The North American Free Trade Agreement ( NAFTA) is an agreement signed by Canada, Mexico, and the United States, creating a trilateral rules-based trade bloc in North America. The agreement came into force on January 1st, 1994. It superseded the Canada-United States Free Trade Agreement between the U. S. and Canada. NAFTA has two supplements: the North American Agreement on Environmental Cooperation (NAAEC) and the North American Agreement on Labor Cooperation ( NAALC). In terms of combined purchasing power parity GDP of its members, as of 2013 the trade bloc is the largest in the world as well as by nominal GDP comparison.