Every province and territory also have different rules and negotiate their relationships with the federation of Canada.
Would you throw out all the Provincial and Territorial federation contracts too?
There are people on both sides of the issue that agree with you though, but it might not play out how you imagine.
Treaties have rights and obligations for both sides to abide to.
Everyone is familiar with the Quebec secessionist movement, and now Alberta is making similar noises. Historically BC, the Yukon, the Maritimes, NFLD, and Saskatchewan all have had a go at it too. While it may be questionable if any Province or Territory has the right to a unilaterally declare independence, in practice if it was done the Crown would lose it's proclaimed rights to those resources and the Provinces/Territories free to negotiate with any entity they wished.
Unceded land controlled by sovereign indigenous nations recognized as such by modern contracts (even ignoring the historical treaties, or the numbered treaties posted by
@Bagua ) could have the stronger legal position to negotiate contracts for their resources.
Now of course Canada could use military force to prevent that happening, essentially declaring war by violation of the Treaties. The indigenous nations would have little hope of resisting. This would affect Canada's standing on the world stage as contract law is considered inviolate. ie. who would do business with a country that doesn't abide by its word? Especially as Canada is a signatory of UNDRIP.
However if say they had negotiated resource contracts or treaties with the USA or even Russia?...
Attached is a link to a map of the areas confirmed by the modern treaties signed as recently as 2018, to give an idea of just how vast these resources are. It is not comprehensive, as numerous other areas are still being contested such as the Northern Ontario Ring of Fire region. Hard to know for sure what any nation might do to have them, but one could look at the Balkanization of other resource rich countries for an idea.
Modern Treaties – Comprehensive land claims and self-government agreements
like I said, sticky situation to resolve.
The US experience was a different one, For history buffs if one digs into the origins of the independence movement, most of the literature talks of escaping onerous taxation. However a large driver was a desire for unfettered westward expansion. At the time the colonies needed to wait for the King to negotiate land claims with the indigenous nations along the way.
Btw, King George wasn't negotiating because he was a nice guy or thought he couldn't take it all by force, but because the indigenous were the major supply lines to the fur trade. It is, and always has been about following the