When did Ontario get founded?
History of Ontario
July 1, 1867
A political stalemate between the French- and English-speaking legislators, as well as fear of aggression from the United States during the American Civil War, led the political elite to hold a series of conferences in the 1860s to effect a broader federal union of all British North American colonies. The British North America Act took effect on July 1, 1867, establishing the Dominion of Canada, initially with four provinces: Nova Scotia, New Brunswick, Quebec and Ontario. The Province of Canada was divided at this point into Ontario and Quebec so that each major European linguistic group would have its own province.