Sorry, you didn't provide anything. Certainly not anything "well known and routinely acknowledged". Well, maybe well known and routinely acknowledged in the US, where everything is defined by It's relationship to the US, but in fact most Canadians don't pay any attention to the difference between us and Americans. We just take it as a given, especially since the difference is reinforced by everyone else around the world. There's no risk of confusing the two, no need to emphasize the difference.
Want a bit of fun? Next time you go outside of America -uh, you are American, right? Next time you go to another country, see if you can pull off impersonating a Canadian. Just for shits and giggles. If you do pull it off, see how your reception is different from when you were recieved as an American. My money says you couldn't be taken as Canadian, but I bet I could be taken for American. Which says Americans are defined as not Canadian.