1822 Chippewas turn over huge tract of land in Ontario to the United Kingdom.
1832 The Rideau Canal in eastern Ontario is opened.
1867 Toronto becomes the capital of Ontario.
1982 Turkish military diplomat Colonel Atilla Altıkat is shot and killed in Ottawa, Ontario, Canada's capital. Justice Commandos Against Armenian Genocide claim responsibility, saying they are avenging the massacre of 1.5 million Armenians in the 1915 Armenian Genocide.
1989 SkyDome is officially opened in Toronto, Ontario
1999 Toronto, Ontario Mayor Mel Lastman becomes the first mayor in Canada to call in the Army to help with emergency medical evacuations and snow removal after more than one meter of snow paralyzes the city.