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How's this an idea for an ARW- the Eddy Rebellion, thanks to greater public support, manages to seize Fort Cumberland. The presence of the British fortress in Halifax prevents the revolutionaries from seizing all of Nova Scotia, but the British are weakened in the area. Ultimately they end up securing the lands west of the Isthmus of Chignecto for the Patriots.
However, butterflies elsewhere end up having the British remaining in control of Georgia.
So, you have an early American republic that extends further north (no Quebec, however), but less south. How could this work out?