There was a lot of Anger in America when Britain gave Louisbourg back in 1748. However OTL the "Baron of Boston"* never attracted much political Traction.Nova Scotia was ceded to France
ITTL I can see More anger, and The Baron gaining more, maybe even becoming Mayor of Boston.
I also see a lot more Americans Smuggling to the Spanish America, OTL Britain tried to keep the American smuggling to a minimum. ITTL the British will be a lot angrier at Spain.
I doubt a 1763 line. With the French claiming the Ohio and Mississippi Valleys [both sides] and the Spanish the Gulf Coast - Britain will encourage Settlers to move West.In North America French claims in the Ohio Valley were accepted,
Wonder if King George paying more attention to Hanover --?Will whe have - More? or Less? immigration from Germany?
My guess is More as the increased problems in the HRE feeds emigration. Whe may also have King G, Hiring Germans as Mercenary troops for America.
OTL the British gaining of Florida in 1764, stopped the growing escape of Slaves into Florida, Here it will continue, Upsetting the small but growing population of Slave Holders.
If Whe are lucky - the movement of Slave holders into former Free Georgia, will slow or stop.
* A prominent Boston Merchant who financed the Attack. OTL He was Knighted for his leadership in the 1745 capture of Fort Lousisbourg. First native born American to be Knighted