No, what I was talking about was a large Northwest Indian territory maintained by treaty and force of arms much like the one demanded by the British as a condition for the end of the War of 1812. Had the British remained more constant, or not have suffered a couple of setbacks in the last months of the war, it very likely could have been a reality.
Once that happened, white settlement may have been diverted around that territory to other more easily taken areas.
I see your point. Yes, a large reservation might have been established following the war of 1812, but I strongly suspect it would've had no more success than other reservations and treaties established elsewhere in North America. Remember, the Canadians (who were "British" 100 years longer than the "Americans" were British) didn't do much better than the USA when it came to settling "the Indian question".
And certainly, the British were the allies of the eastern Indians against the Americans.
You're speaking of the Revolutionary War? The War of 1812? I'm not sure you can characterize the utilization of irregular Indian warriors in either of those conflicts in the same context as the French did in the F&I Wars, when they were true allies of the French, but I'll concede the British did a good job of capitalizing on the relationships previously established by the French.
