The Evolution of Ontario's Boundaries 1774-1912 |
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Scroll down the page to see the evolution of Ontario's boundaries between 1774 and 1912, or click on a year in the table to go directly to a particular time period.

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1774
The Quebec Act (1774) included what is now southern and central Ontario south of the Arctic watershed into the Province of Quebec. What is now Northern Ontario north of the Arctic watershed was part of Rupert's Land, a territory granted by the British Crown to the Hudson Bay Company. |

1791
The American Revolution and the arrival of the Loyalists led to the Constitutional Act (1791), which separated the Province of Quebec into Upper Canada (current southern Ontario) and Lower Canada (current southern Quebec). |
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1840
Following aborted rebellions in both Upper and Lower Canada (1837-1838), the Act of Union (1840) merged the two colonies to form the Province of Canada. Upper and Lower Canada became Canada West and Canada East.
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1867
The British North America Act (1867) merged the Province of Canada, New Brunswick and Nova Scotia to form the Dominion of Canada. The provinces of Ontario and Quebec replaced the former Province of Canada. |
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The federal government awarded the Kenora area to Ontario in 1889. At the same time, the Albany River became the province's northern boundary.
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