AHC: Earliest Possible Canadian Confderation

So as a challenge, how would you have the four original provinces of Canada decide to join in confederation earlier than the OTL timeline?
 
I suppose the earliest is the American Revolutionary War. If Britain has a more forward looking government, they might set up something like the Dominion of Canada to provide the Loyalists with a third option to 'split the vote' in the Thirteen Colonies. If that still didn't work you'd end up with an independent USA and a self governing Canada.
 
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