Why Canadians say "EH?"

EH?, n. [Colloq.] Canadian term for right?, Okay? Please, maybe, thank you, how about it?, don't you?.
Used after a statement or question. Said with spirit and pride even to Americans and other visitors.
Why do Canadians say EH?
IT'S BETTER THAN SAYING HUH!

Jared and I went out into town for lunch. I tried to find some poutine for him to try, but this fat kid can't afford to eat more of that junk!

He looks lost...he can't speak French and he doesn't know his way around. Good thing he has me around who also cannot speak French and I do not know my way around either!