Contemplating whether there's such a thing as a Canadian identity, and what it might be, has been a national pastime probably for as long as Canada has existed. And there's no way to talk about Canada or Canadian politics without taking regionalism into account. None of this is new, but amid pressures or circumstances, such as extreme polarization, could that malleable idea of Canada become too weak to hold it all together? We consider that with guests: Margaret MacMillan, author and emerita professor of International History at the University of Oxford, and University of Toronto; Ken Coates, Canada Research Chair in Regional Innovation at the University of Saskatchewan; Paul Wells, author of "An Emergency in Ottawa: The Story of the Convoy Commission;" Akaash Maharaj, Ambassador-at-Large for the Global Organization of Parliamentarians Against Corruption, and a Senior Fellow at the Munk School of Global Affairs and Public Policy at the University of Toronto; Daniel Bernhard, CEO of the Institute for Canadian Citizenship; and Lydia Petrovic, author of "Lost in Canada; An Immigrant's Second Thoughts."

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