Well:
1. Canada is the largest consumer of US goods and services,
2. Especially with the huge drop in the US dollar, our wages are pretty close to parity *except* we don't really have any part of the country that's as insane for cost of living as New York or Silicon Valley.
3. It's pretty much accepted that our lumber is as good as it gets.
However, perhaps only the last condition (dumping) should force a true free trading nation to retaliation.