The North American Union (NAU) is a theoretical economic union, in some instances also a political union, of Canada, Mexico, and the United States. The concept is loosely based on the European Union, occasionally including a common currency called the Amero or the North American Dollar.While the idea for some form of union has been discussed or proposed in academic, business and political circles for many decades,government officials from all three nations say there are no plans to create such a union and no agreement to do so has been signed.The formation of a North American Union has been the subject of various conspiracy theories.