How did Britain gain control of Canada from the French?

Canada gained nothing from World War 1. They only joined the war because they were apart of the British Empire and needed to keep their alliance with Britain.

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Canada entered the war because of a huge surge of support for England. Entering the war had nothing to do with keeping up an alliance. WW1 and Vimy Ridge in particular, was seen as a watershed for Canada with the country becoming more independent.