Yeah, poutine basically does not exist in US, it is entirely a Canadian food. Like it was said, we put stuff on fries, and we put gravy on stuff, but we don't put gravy on fries - it's just not a thing. I have never seen poutine offered in any fast food restaurant, ever - not as a normal item anyway, I'm sure if you wanted KFC to pour some gravy on your fries they could manage. But no, poutine is everywhere in Canada and nowhere in the US.
Personally it's just not my thing. I'm not really big on gravy, and I think it makes fries too soggy when I like my fries crispy.