The long history of friendship between the U.S. and Canada has ruptured, can it ever be rebuilt? What is the best Canadians can expect in the Tariff negotiations with Mr. Trump seeing that over 70% of Canada's exports go to America? Where does Canada go to lessen its trade reliance on on the U.S.------------------------------------------------------------------- JEREMY PALTIEL Professor of Political Science (emeritus)  at Carleton University, Canada. He is author of several chapters included in edited volumes.  His published articles appear in numerous publications including The China Quarterly and Asian Affairs.