April 11 – Canadian Margaret C. MacDonald is appointed Matron-in-Chief of the Canadian Nursing service band and becomes the first woman in the British Empire to reach the rank of major.
May 14 – First major discovery of oil in western Canada at Turner Valley
May 20 – The Niagara Falls peace conference begins. Representatives from Argentina, Brazil, Chile and the United States met for diplomatic negotiations in order to avoid war between the United States and Mexico
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