Amero

The North American monetary union is a theoretical economic and monetary union of three North American countries: Canada, the United States and Mexico.

Implementation would involve the three countries giving up their current currency units (U.S. dollar, Canadian dollar, and Mexican peso) and adopting a new one, created specifically for this purpose (some versions of the theory assume only the United States and Canada would be included). The hypothetical currency for the union is most often referred to as the amero. The concept is modeled on the common European Union currency (the euro).

One argument is that it would save up to $3 billion in currency transactions. The same authors also stated that Canada's GDP could rise by up to 33 percent in a 20-year period given the adoption of a single currency.

The idea of a common currency has historically been unpopular in English-speaking Canada, in comparison to the French-speaking province of Quebec where it has received more support. A 2001 opinion poll found that in Quebec over 50 percent of respondents favored the idea of a shared currency, while in the rest of Canada a majority of respondents opposed the idea.

Lower levels of currency cooperation have been practiced in the Americas before. Some nations such as Argentina and Brazil have at times tied their currency to the U.S. dollar. Some of them, such as Aruba, Bahamas, Barbados, and the Organisation of the Eastern Caribbean, still do.

The U.S. dollar is officially accepted alongside local currencies in El Salvador (since 2001), Costa Rica, Nicaragua, Peru, Honduras, Panama, Bermuda and Barbados, although in practice two of these countries (El Salvador and Panama) are fully dollarized. In 2000, Ecuador officially adopted the U.S. dollar as its sole currency. In a few areas of Canada, the U.S. dollar can be accepted as currency alongside the Canadian Dollar, particularly in areas near border crossings. An example of this effect is Niagara Falls, Ontario, with large numbers of U.S. tourists (businesses still may not accept U.S. currency depending on their policy). The same is also true for the Canadian Dollar in many U.S. cities bordering Canada.

...
Wikipedia