Uh pretty sure protection of French language (and Catholicism) was agreed on from the start. Otherwise there would have been rebellions.
Language, religion, and laws. This is why Quebec is predominantly French, doesn’t use British common law like America and the rest of Canada, and was predominantly catholic at a time when a lot of places required you to follow the king’s (or queen’s) religion.
And why a Catholic school board exists in the entire country. We’re far past the point it should be allowed to exist, but afaik it’s in the constitution and hard to get rid of.
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I’m responding to “tried to eradicate the French spoken there”. When they took over, I’m pretty sure they agreed to the French language and Catholicism from the very beginning. They didn’t try to eradicate it. Protection didn’t come from failed eradication attempts, protection was agreed to from the start.