Prime Minister Justin Trudeau and US vice-president Joe Biden walk down the Hall of Honour on Parliament Hill in Ottawa on Friday, December 9, 2016. Barring a stunning turn of events that no serious political observers really expect, Biden will become president of the United States next month, putting an end to Donald Trump's tumultuous four years in the Oval Office. But questions persist for Americans and Canadians alike: aside from friendlier rhetoric, will U.S.-Canada relations really improve with irritants like Keystone XL and Buy American looming large? THE CANADIAN PRESS/Patrick Doyle