David Frum: “The Trump administration has one big idea about Canada: The U.S. is larger, stronger, and richer than Canada, so Canada must sooner or later surrender to Trump’s demands. That one big idea is wrong.”“Yes, Trump can hurt Canada more than Canada can hurt Trump. That part of Trump’s thinking is true. But wars are not decided only by the question Who can inflict more pain? Wars are also decided by the question Who can endure more pain? Trump’s failure to accept this truth is why he lost the Iran war—and why he is losing his trade wars.”“Canadian Prime Minister Mark Carney has much more political permission to accept pain from a U.S.-Canadian trade war than Trump does.”