It's not at all clear to most Americans what the consequences are. This pipeline, for example, sounds like something Americans should welcome because it will finally allow Canada to offer its oil to the world market in significant quantities. It will allow Canada to export significantly more than they do now, pushing down prices. It wasn't built until now purely because of internal Canadian environmental concerns. If Canadians think it's a good idea to now destroy vast amounts of their forest to get to some of the most difficult to process oil in the world, then that's what it is and they get to make some money as a benefit. But it doesn't seem at all like some kind of rational reaction to American foreign policy.