WI: Great Britain retained the Electorate of Brunswick after the Napoleonic Wars?

Hanover was returned to Britain following the wars... Did you mean to say it was elevated to one of the constituent countries? That might be difficult to do for a number of reasons, first and foremost of which is that many Englishmen disliked continental holdings as that forced them to engage in more continental affairs instead of being relatively isolationist. Hanover itself, as a different country, also had different laws including those for inheritance. The reason why it fell away from the Crown was because Queen Victoria could not inherit the throne as a female, instead having her uncle take it. It is likely that a male heir would have to inherit the throne to keep Hanover in a personal union, or for George III to abolish those laws and elevate it. In a Congress of Vienna setting, there is no way the other treaty countries would purposefully allow this more permanent union to happen.
 
I dunno, the continental powers might wanna force it upon Britain, force them to do some of the dirty work in the next pan-european conflict instead of just chilling on their island. ;)
 
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