Prime Minister Mark Carney is celebrating Canada Day in Edmonton today, but this isn't your typical birthday bash. On the same day the CUSMA trade review kicks off and an Alberta separation referendum inches closer to the ballot, Carney is making his most aggressive play yet to reverse a half-century of western alienation — even if it means admitting his predecessor got it wrong.

Background

Carney released a 17-minute video Tuesday accusing Ottawa of making...