Stormont, Dundas and Glengarry, Ontario
Located in Ontario, part of Eastern Canada
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The United Counties of Stormont, Dundas and Glengarry were formed in 1850 by unifying the three counties of Stormont, Dundas, and Glengarry.
| 1792 | Stormont County, Upper Canada, Dundas County, Upper Canada, and Glengarry County, Upper Canada formed |
| 1841 | Acts of Union 1840 created a single Province of Canada (Stormont County, Province of Canada, Dundas County, Province of Canada, and Glengarry County, Province of Canada) |
| 1850 | Counties are merged to produce Stormont, Dundas and Glengarry, Province of Canada |
| 1867 | Canadian Confederation established the modern province of Ontario (Stormont, Dundas and Glengarry, Ontario) |
