CANADA AND America’s economies are joined at the hip. Some $2bn of trade and 400,000 people cross their 9,000km of shared border every day. Canadians on the west coast do more day trips to nearby Seattle than to distant Toronto. No wonder, then, that the two economies have largely moved in lockstep in recent decades: between 2009 and 2019 America’s GDP grew by 27%; Canada’s expanded by 25%.