FEAR NOT, folks.... because "Canada" will not be subject to "US" border taxes..... because English Canada will elect to merge into the USA thus creating a United North America english speaking country. 

(Quebec will be cast off and form a new French-only country in N. America... Le République du Québéc... and led by it's first présidént ... Justin dela Trudéau!)

So it's accept merger or suffer border taxes and total economic decimation and then begging for a rescue merger.  I vote for merger and continued prosperity... oh, and the elimination of the loonie, toonie and the woman on the $10 banknote!)