I, being from BC, know that at least some states (california in particular) buy incredible amounts of electricity, water, and lumber from here. I don't know numbers but I know that lots of our resources go across the border. So I think it would be retarded to just stop importing these resources that are necessary for life, because clearly these resources aren't as accessible or cheap in the US.
However, I think this issue is probably more about material things, rather than resources. So they're encouraging you to buy american-made products. Not a big deal really. Every community encourages buying local stuff. I don't know any economics really, so I'm not going to pretend to know the benefits or negatives of the decision.
Ripping out canadian piping just because it's canadian-made, and replacing it with new, costly american piping sounds stupid enough that a 10 year old could probably recognize it. I'm sure there is another reason for doing that. Unless this somehow demonstrates patriotism for the rednecks and is meant to encourage more votes for next time.