In this scenario, the Canada-U.S. border would be open to goods, services and people.  This could include the creation of a security zone around the two countries where the focus is on security along national borders. The perimeter approach has been publicly discussed by U.S. and Canadian officials.  It has been suggested that this approach could raise concerns that such an agreement would set a precedent for a subsequent similar agreement with Mexico.  Two months later, at the North American Heads of State and Government meeting in March, the Partnership for the Security and Prosperity of North America (SPP) was established. The heads of state and government of Canada, Mexico and the United States have called it a dialogue that should allow for closer cooperation on security and the economy.  In response to future concerns, a section was created on the initiative`s website, stating that the PPS was not a legal agreement, that the initiative „does not seek to rewrite or renegotiate NAFTA“ and that the partnership itself „does not create a legal status for NAFTA anymore.“  A number of academics and government officials considered the PPS to be a North American movement toward greater integration.  The main provisions of NAFTA required a gradual reduction in tariffs, tariffs and other trade barriers between the three Member States, with some tariffs to be abolished immediately and others over a 15-year period. The agreement guaranteed duty-free access for a wide range of industrial products and goods traded between the signatories. „Domestic goods“ have been granted to products imported from other NAFTA countries and prohibit all governments, local or provincial, from imposing taxes or tariffs on these products.
Although NAFTA has not kept all its promises, it has remained in place. Indeed, in 2004, the Central American Free Trade Agreement (CAFTA) extended NAFTA to five Central American countries (El Salvador, Guatemala, Honduras, Costa Rica and Nicaragua). In the same year, the Dominican Republic joined the group in signing a free trade agreement with the United States, followed by Colombia in 2006, Peru in 2007 and Panama in 2011. The Trans-Pacific Partnership (TPP), signed on October 5, 2015, represented an extension of NAFTA to a much larger extent. In academic, commercial and political circles, a form of association has been discussed or proposed for decades.     However, representatives of the governments of the three nations assert that there are no plans to create a North American Union and that no agreement has been proposed to that effect, let alone signed.    The creation of a North American Union has been the subject of various conspiracy theories.     Many critics of NAFTA viewed the agreement as a radical experiment developed by influential multinationals who wanted to increase their profits at the expense of ordinary citizens of the countries concerned.