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. Such a proposal is supported by globalists and opposed by conservatives.
There's nothing secret about plans to morph the United States into a North American Union. - Phyllis Schlafly 
In August 2018, the Government Accountability Office published a document discussing efforts between the U.S., Canada, and Mexico to integrate their energy infrastructure, with support between the governments for "aligning energy regulations" among other goals.
- 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) 
- Gomez, Christian (August 31, 2018). Shocking Government Report Outlines “North American Energy Integration” Scheme. The New American. Retrieved August 31, 2018.