Depending how they manage the federation, Canadian prime ministers have been variously described as headwaiters, cheerleaders, referees or dictators. The latter was often attached to Stephen Harper, the supposed autocrat who shunned first ministers’ meetings and allegedly ran roughshod over the provinces. But on his watch, especially compared to the tumult of the Pierre Trudeau and Brian Mulroney eras, there was relative peace in the kingdom: Western alienation and Quebec nationalism both receded. It may be a tough act to follow for new Prime Minister Justin Trudeau – the self-described “referee” of the federation – who is already facing a nasty East-West divide over pipelines. D’Arcy Jenish explains.