As much as we insult Canada we get alot of stuff from them(perscription drugs) and they get alot from us(basis of their constitution)
Basis of our constitution, eh? How do you figure that? Are you talking about the British North America Acts which certainly had nothing to do with the US? Sorry to burst your bubble, but our constitution, cour system, parliament, all of it is quite British.
Don't worry about insulting Canada

I think you'll find we return the favour - in spades.
And Den is right, North American-ers, I suppose, technically are American's. Got me on that one.
Here are some other good Canadian exports:
Basketball (yes, invented by a Canadian)
Superman (co-invented by a Canadian)
Telephones (Alexander Graham Bell is a Canadian)
Wayne Gretzky
Jim Carrey
William Shatner
Acrylics
dental mirror
Electron Microscope
Green Plastic Garbage bags
IMAX
Insulin
Java
lightbulb
Pablum
Rollerskate
Trivial Pursuit
Washing machine
Yachtzee
Bet y'all thought these were American, eh?

Refernence:
http://www3.sympatico.ca/taniah/Canada/things/At any rate, this is a roll call for non-US members. Arrr - what about you?
OD