Confused by Brexit? Get ready for “Wexit.” Political leaders representing a large chunk of Canada are talking about breaking off from the rest of the country in the wake of Justin Trudeau’s re-election victory — and this time they’re not primarily in French-speaking Quebec, long known for its independent streak. Instead, it’s the country’s western, oil-dependent provinces fueling the breathless talk of secession, amid a perception that Trudeau and eastern urban liberals are calling the shots at their expense. And it's emerging as one of Trudeau’s most complicated headaches as the Prime Minister moves toward the start of his second...