The statue of John A. Macdonald, in Montreal, on Mar. 21, 2019.Ryan Remiorz/The Canadian Press Charlotte Gray is a biographer and historian who won the Pierre Berton Award in 2003. The Governor-General of Canada usually chooses her words with careful, unsmiling deliberation. But her anger at the way that Canadian history has, until recently, been taught in our schools was unmistakable. “It has been uneven and it is unfair,” Mary Simon said. “This country is so diverse, but for the longest time our history didn’t reflect the richness of that diversity. Indigenous people were misrepresented. This was racism presented as...