The United States Government has a website with a section dedicated to “destroying myths” about the Security and Prosperity Partnership of North America (SPPNA or SPP). They failed to accomplish their goal due to a lack of facts, as the documentation for the two examples below illustrates:
Security and Prosperity Partnership of North America (SPP)
Myth vs. Fact
Myth: The SPP was an agreement signed by Presidents Bush and his Mexican and Canadian counterparts in Waco, Texas, on March 23, 2005.
Fact: The SPP is a dialogue to increase security and enhance prosperity among the three countries. The SPP is not an agreement nor is it a treaty. In fact, no agreement was ever SIGNED.
The Truth: “Thus, on March 23, (2005) President Bush, President Fox and I SIGNED the Security and Prosperity Partnership of North America that establishes the way forward on our CONTINENTAL agenda for security, prosperity and quality of life. It is a partnership that respects the past but is devoted to building for the future, to insuring that we as NORTH AMERICANS are able to continue to thrive in a world in which China and India have emerged as economic giants.”
That comment is from a ‘Foreword from the Prime Minister’ and is signed at the bottom by The Right Honourable Paul Martin, Prime Minister of Canada. You can find it at the Canadian site listed below. If it was not an agreement that the three leaders signed, what was it? I recommend that you print a copy since the Canadian government site that had it available deleted it and this may be next. 
Myth: The SPP is a movement to merge the United States, Mexico, and Canada into a North American Union and establish a common currency.
Fact: The cooperative efforts under the SPP, which can be found in detail at http://www.fas.org/sgp/crs/row/RS22701.pdf, seek to make the United States, Canada and Mexico open to legitimate trade and closed to terrorism and crime. It does not change our courts or legislative processes and respects the sovereignty of the United States, Mexico, and Canada.. The SPP does not attempt to modify our sovereignty or currency or change the American system of government designed by our founding fathers.
The Truth: The SPP, a corporate/government alliance project, is being constructed from the Council on Foreign Relations Task Force plan for Building a North American Community (2005). It is being put together by working groups in the U.S. Department of Commerce under the direction of Geri Word, who is coordinating with other working groups in Canada and Mexico. They are currently harmonizing and integrating areas and processes of the three nations that can be done without legislation.
The guidance for building this union is detailed by the U.S. State Department on a U.S Embassy website which clearly links the CFR Task Force plan to the SPP. 
Text from the embassy website:
“Members of the Independent Task Force on the Future of North America, which was coordinated by the Council on Foreign Relations, discussed a detailed set of proposals that build on the recommendations adopted by Canadian Prime Minister Paul Martin, Mexican President Vicente Fox, and U.S. President Bush at their trilateral summit in Texas during March. The task force’s recommendations are intended to provide SPECIFIC ADVICE on how the Security and Prosperity Partnership of North America (SPP), which was ADOPTED at that summit, can be pursued and strengthened.” ( The U.S. Government’s SPP website seems to have omitted the role of the Council on Foreign Relations plan for a North American Community.)
Also on the embassy website is a press release from the CFR Task Force dated May 17, 2005: In it “The Council-sponsored Task force applauds the announced ‘Security and Prosperity Partnership of North America,’ but proposes a more ambitious VISION of a NEW COMMUNITY BY 2010 and SPECIFIC RECOMMENDATIONS on how to achieve it.”
The three leaders have embraced the proposals of the CFR Task Force and have attempted to implement the most important ones, those that are key to achieving a union of North America but need legislative action before they can move foward.
In the United States, Republicans in the Senate and the House have submitted bills containing this legislation which sets up the framework for a union. So far none have passed. Some of the lawmakers who submitted bills aiding the merger of North America into a union and who stand in violation of their oath of office include: Senator Richard Lugar, [R-IN], CFR member Senator John McCain, [R-AZ], Senator John Cornyn, [R-TX], former Rep. Katherine Harris (CFR), [R-FL].
These proposals from the task force needed to complete the new community of North America by 2010 can be found on the embassy website by clicking on the links at the bottom of their webpage (Building a North American Community). I listed a few proposals below, some of which can be found in legislation, including immigration bills, submitted by Congress over the last two years:
“Establish a common security perimeter by 2010.” This security perimeter around North America will open the internal borders to the free flow of people and commerce throughout North America. Workers can eventually “live and work” anywhere on the continent. To make this possible, a single North American driver’s license/ID is being developed (called REAL ID in the U.S., passed by Congress in 2005). The result would be a “functional union”, in the process of forming governing institutions for North America. p.8, 
“Develop a North American Border Pass with biometric identifiers.” p.8
“Expand temporary worker programs and create a “North American preference” for immigration for CITIZENS of NORTH AMERICA.” p.27
“Institutionalize the partnership:
“Establish a permanent tribunal for trade and investment disputes.” The NAFTA tribunals have already heard cases from foreign corporations suing the three governments of North America under NAFTA’s Chapter 11. They have also reviewed lawsuits filed in the regular court systems. The tribunal, in its area of competence, can review and overturn decisions made by any court in the NAFTA member states, including the United States Supreme Court. So much for sovereignty. p.21
“Convene an annual North American summit meeting.” The leaders of the United States, Canada and Mexico completed their third summit meeting this year. p.31
“Establish a Tri-national Competition Commission to develop a common approach to trade remedies.” The NACC (North American Competitiveness Council) was eastablished as a PERMANENT INSTITUTION in 2006 and is advising the three leaders on how to complete this union and operate it. The 30 appointed members, 10 CEOs from each nation (Examples; Wal-Mart, UPS) would eventually propose legislation for a NORTH AMERICAN INTER-PARLIAMENTARY GROUP (a parliament) and act as a “voice for North America.” pp. 31, 32
As for a common currency, that was suggested by Robert Pastor (among others), Co-Chair of the CFR Task Force report on Building a North American Community.
Vicente Fox, in an interview on Larry King, responded to a question on how he felt “about the possibility of having a Latin America united with one currency?”
He said that it would be in the “long term, very long term…What we proposed TOGETHER, President Bush and myself, it’s ALCA, which is a trade union for all the Americas.” 
That is the proposed FTAA (Free Trade Area of the Americas), a trading region of the Western Hemisphere consisting of 34 nations (including the United States) run by a trade agreement bureaucracy. And that common CURRENCY would also include the United States. And the trade agreements would have sovereignty (if they conflict) over the laws, regulations, etc. of any government at any level in the FTAA member states. 
The U.S. Congress would still exist under a North American Union but like the current parliaments in England and Germany, it would be impotent. The reason; up to 80 percent of their laws and regulations are passed by the European Parliament with no input or veto from the local (national) parliaments. And a new constitution (now called a treaty) is being pushed through without a referendum, destroying much of what sovereignty is left. 
All the U.S Government has done on their site is make statements with no documentation. In fact, they lied.
 See last paragraph under ‘Canada in North America’.http://www.cfr.org/publication/8121/building_a_north_american_community.html
 This government site is no longer available (http://canada.usembassy.gov/content/textonly.asp?section=can_usa&document=nataskforce_051805) but you can find the it here.) Updated June 16, 2011.
 This blog: Congressmen Who Betray America, December 10, 2006, NAFTA: Stealing Sovereignty in Violation of the U.S. Constitution, January 28, 2007, A North American Government: Documentation, April 9, 2007
http://www.thesigintreport.com John McCain: In Violation of his Oath, April 3, 2007
 http://www.thesigintreport.com The North American Driver’s License: Preparation for a North American Union, September 24, 2007, under NAFTA, North American Union
 http://www.thelastgringo.com Vicente Fox Declares support for North American Union, FTAA, October 12, 2007
 http://www.ftaa-alca.org/FTAADraft03/Index_e.asp Chapter II, General Provisions, Article 4, (4.1, 4.2)
 http://www.thesigintreport.com British citizens want out of European Union: America take note, August 2, 2007