North American Union
A North American Union (NAU) of the economic and governmental systems of North America has been proposed, similar to how the European Union merged important aspects of the nations of Europe. Its introduction would require the approval of Congress. Conservative analysts have discussed the proposal for several years.
There's nothing secret about plans to morph the United States into a North American Union. - Phyllis Schlafly 
- Angeles Villarreal, M & Lake, J.E. Security and Prosperity Partnership of North America: An Overview and Selected Issues; CRS Report for Congress; Page numbers CRS-4-5, (January 29, 2008)