I agree that it doesn t have to be used every time but the edit eliminated all use of the word Dominion from the article I think that the use of the title Dominion of Canada to reflect the semi independent federation of British territories that was Canada in 1885 just once is a good way to disambiguate the 1867 1931 use of Canada from say Canada as a colony in New France The Province of Canada of 1841 1867 or even our current setup