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Case Title & Citation
R. v. Sioui, [1990] 1 S.C.R. 1025. -
Decision Summary (Neutral Overview)
Members of the Huron-Wendat Nation were charged with violating provincial park regulations while conducting ceremonies and cutting wood in Jacques-Cartier Park. They invoked an 18th-century agreement between British authorities and their Nation.
The Supreme Court held:
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The agreement was a treaty within the meaning of s. 35 of the Constitution Act, 1982.
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It protected the Huron-Wendat’s right to continue certain practices on the land.
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Provincial regulations could not override that treaty right.
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Historical & Legal Context
Sioui is a landmark in recognizing historic agreements with Indigenous nations as living treaties, even when not labelled as such by the Crown at the time. -
Key Legal Principles Identified in the Case
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Broad, generous interpretation of Indigenous treaties.
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Pre-Confederation agreements can bind provincial governments today.
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Provincial laws of general application must give way to valid treaty rights.
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Implications for Haldimand, Loyalist, and Mohawk Questions
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Sioui strongly supports viewing Haldimand, the Haldimand Pledge, Dorchester’s Mark of Honour, and Simcoe’s Proclamation as a bundle of treaty-like instruments—constitutional in nature, not mere policy.
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It supports the argument that Ontario cannot lawfully treat Haldimand lands as simple provincial territory without addressing those instruments.
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Points of Interest to Mohawk of Grand River Posterity
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Sioui shows that courts can recognize relatively obscure 18th-century documents as binding constitutional instruments.
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It undermines any claim that Haldimand is “too old,” “too political,” or “just a letter” to have legal force.
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Unresolved Questions / Future Research Directions
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How would a court handle the four-part Haldimand-Dorchester-Simcoe bundle—as one treaty, a cluster of related constitutional acts, or something sui generis?
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Could Sioui’s generous interpretive approach be used to emphasize Mohawk Loyalist posterity as the central rights holders?
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Sources
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R. v. Sioui, [1990] 1 S.C.R. 1025.
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Scholarship on historic Indigenous treaties.


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