Challenge: Largest possible Tecumseh's Confederacy

How large could Tecumseh's Confederacy be, and what would the effects be on western settlement and the development of the US?
 
Wasn't the claimed territory that of the treaty of Greenville and he also tried to get the Five Civilized Tribes to join in? Feels like his goal is hammering Americans in to the east coast, Ohio, Kentucky, and eastern Tennessee.
 
Long-term the Shawnee would either have to be a British client state, or Britain (probably) would need to so smash the USA they have to spend decades rebuilding what they already have.
 
The problem is that the natives just don't have enough population to keep American settlers out. The only way any 'native' polity could survive is under British protection - and the Brits are far more concerned with trade with the US than their own colonies, like Canada, let alone any native protectorate.

Your best bet that has any plausibility is a much better British/Canadian effort in the War of 1812 (which really needs a PoD earlier to, at minimum, get the French speakers interested in the war effort), and even that will give you only a territory with a native minority (at least a couple of generations later) with some constitutional protections for native rights.
 
Top