I learned something cool in school.
At confederation in 1867, people weren't sure what the full name of Canada should be. "The Kingdom of Canada" was nixed because the American Civil War had just ended and it was thought that the Americans wouldn't take kindly to a British Kingdom just to the north (the British had been sympathetic to the southern states during the Civil War). Naturally, things like "The Empire of Canada" and "The People's Republic of Canada" were out because Canada wasn't an empire or a people's republic.
Leonard Tilley was flipping through his Bible one day and read Psalm 72:3
"He shall have dominion also from sea to sea, and from the river unto the ends of the earth."
Voila! Hence we were named the Dominion of Canada. Whose dominion? :-D This is also reflected in our motto, "From sea to sea". Take that, you politically correct, culturally tolerant, self-proclaimed atheists! Canada was founded on Christian principles. Quit trying to erase history.
“The wide world is all about you; you can fence yourselves in, but you cannot forever fence it out.” J. R. R. Tolkien