I take it your talking about the 27% tariffs America placed on Canadian softwood lumber, for which a settlement was reached in July 2006? If that is the correct incidence, then you must realize that the settlement was not ratified by either nation, that the cause of the tariffs were retaliation for perceived dumping from Canada's lumber companies, and that the agreement, and I quote from the United States Trade Representative press release:
QUOTE(http://www.ustr.gov/Document_Library/Press_Releases/2006/July/US @ _Canada_Reach_Final_Agreement_on_Lumber_Dispute.html)
will undergo a legal review with signatures expected in August. No U.S. legislation is required, but the Canadian Parliament must approve the export charge system after it returns in September. Entry into force is expected in the fall.
If no U.S. Legislation is needed to implement the export charge system, why is it that we are the ones who are holding up the implementation?
some executives thought that Canada shouldn't be America's trading partner
I highly doubt any county would go so far as to attempt to break NAFTA, is possibly the most beneficial thing that has happened to all the countries economies in the past several decades.