Let's say that maybe Queen Anne had children or her catholic relatives converted to protestantism or we have another PoD so that Ernst August son never became King of England. Let's be honest, the personal union had no real advantages for Britain, at the contrary they were pulled into european conflicts and had to defend a german state to which they barely had any real connections. Also Hanover was part of a personal union and was an electorate without an elector for decades and a kingdom without a king for 22 years.
So how would both countries have developed if they never created their personal union? Would GB stayed out of the Napoleonic wars for a longer time? What about the Seven years war?
How would Hannover have developed? I assume they would have joined the seven years war on austrias side because they were rather pro austrian and sweared to only ever vote for a habsburg as emperor to obtain the ninth electoral vote. Would they have been annexed by Prussia if they would have joined the losing side of the seven years war? Or maybe they would have joined Prussia because the wife of Friedrich II, his mother and his nephew were Welfen so there were family connections.
What about the Napoleonic Wars? Tbh I strongly assume that Hannover would have joined Napoleon because except Austria and Prussia, every major german state joined him (Württemberg, Saxony, Bavaria, Hessen-Darmstadt and Hessen-Kassel, even minor states like Baden) and he greatly enlarged their territories and upgraded their titles so he turned them to granddukes, electors or even kings. So if Hannover would have joined Napoleon and switched sides early enough (assuming the Napoleonic Wars would also exist and be the same ITTL) Hannover probably would have become a kingdom already in 1806 like Bavaria and probably would have annexed Schaumburg Lippe, Hildesheim, maybe Braunschweig, maybe Bremen and Hamburg, maybe East Frisia and Oldenburg and other minor territories.
So how would both countries have developed if they never created their personal union? Would GB stayed out of the Napoleonic wars for a longer time? What about the Seven years war?
How would Hannover have developed? I assume they would have joined the seven years war on austrias side because they were rather pro austrian and sweared to only ever vote for a habsburg as emperor to obtain the ninth electoral vote. Would they have been annexed by Prussia if they would have joined the losing side of the seven years war? Or maybe they would have joined Prussia because the wife of Friedrich II, his mother and his nephew were Welfen so there were family connections.
What about the Napoleonic Wars? Tbh I strongly assume that Hannover would have joined Napoleon because except Austria and Prussia, every major german state joined him (Württemberg, Saxony, Bavaria, Hessen-Darmstadt and Hessen-Kassel, even minor states like Baden) and he greatly enlarged their territories and upgraded their titles so he turned them to granddukes, electors or even kings. So if Hannover would have joined Napoleon and switched sides early enough (assuming the Napoleonic Wars would also exist and be the same ITTL) Hannover probably would have become a kingdom already in 1806 like Bavaria and probably would have annexed Schaumburg Lippe, Hildesheim, maybe Braunschweig, maybe Bremen and Hamburg, maybe East Frisia and Oldenburg and other minor territories.