Is there a plausible ATL with OTL Us+Canada one country?
I guess the best PoD is all the British colonies revolting in the 1770s.
This might make the Slavery crisis break out all the earlier.
Thoughts?
It's a very commonly discussed notion, and there's a lot of ATLs around which do this, to the extent that Look to the West does this and it's not even the real focus of the TL.