Alexander Macdonell and over five hundred Roman Catholic highlanders leave Scotland to settle in Glengarry County, Ontario.

A Constitutional Act is introduced by the British House of Commons in London which envisages the separation of Canada into Lower Canada (Quebec) and Upper Canada (Ontario).

Construction of Yonge Street, formerly recognized as the longest street in the world, begins in York, Upper Canada (present-day Toronto, Ontario).

Americans defeat the British at the Battle of Longwoods between London, Ontario and Thamesville, near present-day Wardsville, Ontario.

Chippewas turn over huge tract of land in Ontario to the United Kingdom.

The Rideau Canal in eastern Ontario is opened.

Queen Victoria chooses Ottawa, Ontario, as the capital of Canada.

Toronto becomes the capital of Ontario.

Alexander Graham Bell installs the world's first commercial telephone service in Hamilton, Ontario, Canada.

Street railway in Ottawa, Ontario, Canada, commences operation.

The Peace Bridge opens between Fort Erie, Ontario and Buffalo, New York.

The Thousand Islands Bridge, connecting New York State, United States with Ontario, Canada over the St. Lawrence River, is dedicated by U.S. President Franklin D. Roosevelt.

Construction of the CN Tower is completed in Toronto, Ontario, Canada. It reaches convert 553.33 in height, becoming the world's tallest free-standing structure.

The 300 metre tall CKVR-TV transmission tower in Barrie, Ontario, Canada is hit by a light aircraft in a fog, causing it to collapse. All aboard the aircraft are killed.

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.

1985 United States-Canadian tornado outbreak: Forty-one tornadoes hit Ohio, Pennsylvania, New York, and Ontario, leaving 76 dead.

SkyDome is officially opened in Toronto, Ontario

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.

An 87-automobile pile-up happens on Highway 401 freeway just East of Windsor, Ontario, Canada after an unusually thick fog from Lake St. Clair.