then the arw has prussia on the British side, if you're still running with that idea, which would surely affect the way things finish. also, would Germans used to autocratic rule side with the rebels if they were from a German colony? maybe if they were labourers in a British colony but would a colony of Germans run from Berlin really care about taxation without representation? of course, good luck getting parliament to hand over land to prussia anyway. they weren't exactly happy to cooperate with Hanover OTL, except when napoleon was the common enemy...
I wasn't contemplating the cession of British colonies to Prussia - merely that a far higher percentage of their inhabitants would be of German origin.
Of course there might be a German settlement in OTL Georgia, since the PoD would be well before its foundation in the 1730s.