Your comment is the one that is ridiculous.  At what point has the USA defended Canadian Soil?  The USA may monitor Canadian airspace but that does not mean they are defending Canada.  In fact any actions taken by the USA on or around Canada would be purely for their own defense.  So name one time Canada has been defended by the USA.  I can only remember the USA trying to attack Canada, never actually defending it.  Until this happens you are just full of hot air.