Canadians like to say—and print on mugs and T-shirts—that “Canada is Hockey.” No fewer than five Canadian cities and towns claim to be the birthplace of ice hockey, including Windsor, Nova Scotia, which has an entire museum dedicated to the sport. Canada’s annual Hockey Day, which falls on February 9 this year, features a TV marathon of hockey games. Such is the country’s love for the game that last year’s broadcast was watched by more than 1 in 4 Canadians.

But...