The Ambassador Bridge in Windsor, Canada, that connects with Detroit, on Feb. 1, 2025. Canadians won’t be dropping elbows anytime soon, as new and threatened tariffs endanger jobs and the existence of companies both large and small. (Ian Willms/The New York Times) By VJOSA ISAI Canadians responded to President Donald Trump’s first round of tariffs a year and a half ago with a grassroots effort to bruise the United States, boycotting alcohol, vegetables and cross-border travel. They rallied…
