Rich in America (in Canada and Mexico too): A penny for your thoughts

Many people like to dream up ways to get rich quick. Many people dream about inventing great things that could make them wealthy in a hurry. I often think about money also, but just in case you haven't figured it out yet, please be warned that I have some unconventional ways of thinking.

The money question I wish to place before you today is a concept which I have never gotten a decent answer to. When I pose this question I get blank looks, shrugged shoulders, an occasional sneer, and most often a good hearty "who cares!" Be that as it may, I place my query here for you today in the hope that I might get at least one good answer. Here's the question:

What would be the immediate and long-term economic effects if the United States, Canada, and Mexico were to equalize their currencies and maintain a neutral currency exchange rate?

There, now that's not such a stupid question is it? I'm sure that the question has already been fully addressed in other forums and I would very much welcome any links that readers could provide to appropriate discussions of this concept. I welcome any and all answers. Thanks in advance for your time.