Before the Canadian Citizenship Act came into effect on January 1, 1947, Canadians born in Canada and naturalized immigrants were considered British subjects.
This story was published on CBC News. For the rest of the story please read the story right here https://www.cbc.ca/archives/the-day-a-pm-was-handed-the-1st-canadian-citizenship-certificate-1.4954557?cmp=rss.