I do wonder however how willing the British would have been to concede all of the continent to American rule. If anything, I thought that Hudson's Bay Company would inexorably expand, giving the British much the same claims as they had OTL. I don't know anything for sure, however.
The British political establishment in the 19th century had an irritating habit of seeing the USA through rose-tinted spectacles as 'our slightly wayward cousins'. And that was OTL, after the War of 1812. Lord knows how'd much they'd have cheerfully signed away without it...![]()
Agreed - HBC was too thin on the ground to maintain a credible claim to the northern half of the NorAm bread basket. A scattering of fur trading posts wouldn't be able to keep the settlers out, and in fact would probably be happy to supply them the means to chop forests and sow fields. If anywhere were to be texafied in TTL it would be here, if the UK didn't ceded it amicably. It may be a gradual thing, with the HBC being pushed into more and more northern lands for just as long as the Americans didn't see a value in it's holdings, but it wouldn't last. Just as in OTL a land empire would turn into a more credible commercial enterprise.
And besides, the Americans wouldn't feel constrained by a land warrant granted by a British King...