When the leaders of Mexico, the United States and Canada announced last March that they had agreed on the terms of the Security and Prosperity Partnership of North America, questions were raised as to what would be the scope of this new accord. Was the partnership different from the North American Free Trade Agreement (NAFTA) which went into effect on Jan. 1, 1994? Would it be a continuation of NAFTA? Or would it nullify NAFTA and replace it with a more up-to-date relationship between the three countries? Some of the language used in the documents outlining the partnership reflect new...