(*) If you do the google search on “war of 1812” the top (and perhaps the only) results would be this epic event which involved a whooping 90,000 combatants on both sides and unprecedented (by that time) total loss of 25,000 dead. For the obscure and totally historically insignificant minor event which happened at the same time on the other side of the Atlantic you have to look for The French invasion of Russia, or Russian Campaign, or the Second Polish War, or the Second Polish Campaign or the Patriotic War of 1812. 😂😂😂
Tragic-- but still, imagine being (country) Georgia...
With France being out of Germany and Italy, what would be a fundamental reason for Britain not to “tolerate” the situation?
Well, France would still control the entire near-Britain coast up to Friesland, and through the Netherlands it theoretically holds title to South Africa and the East Indies. It could be possible that this sensible (well, as sensible as the French Republic can be) France still gets into some form of naval conflict. And in the long term France will be far and away the most industrialized country in the world, it will even overtake Britain-- but its ethnic diversity will be its Achilles hell and Britain would be wise to take note.
Although another thing is that France wouldn't be able to use marriage diplomacy with Austria. You could argue it didn't do Napoleon a whole lot of good but it's yet another option taken off the table, and without a crowned head France's polity is still an offensive anomaly (this maybe doesn't apply as much to Britain as to the Continent). If they had a king, hell they could even be included into a German Confederation-- the British crowned head got to join on the basis of also being the crowned head of Hanover, but the French have cut theirs off. It doesn't necessitate war, but even peace becomes this sort of provisional/ill-defined thing that can't draw on the past language of interaction between states.
This actually would make for a very interesting timeline. The Prussian Reform was brought about by the circumstance of 80% of the country being under occupation. Without the Reform Prussia may continue its decline from Frederick the Great's time (that king's performance may be thought of as an atypical period rather than the norm for Prussia), and Prussia would not have to engage with its liberals like Fichte and mavericks like von Stein. Prussia may end up distinctly out of step not only with its own intellectuals (especially as we go into Hegel, who had no use for Prussia outside its Reform period) but also its own officials and commanders, with no refuge except royalist personalism and no Rhineland resources to make them relevant despite all that. Even if Prussia wanted to try and seek legitimacy through the German national idea despite having none of its OTL post-Napoleonic selling points, that idea would already be embodied in Austria and the HRE, and embodied in the sort of noncommittal way that, for example, sees no inherent contradiction between Prussian/Austrian happiness and continued French occupation or even creeping assimilation of the Rhineland. And oh yeah, Poland-- Prussia would have Warsaw, and if Austria would choose Budapest over Frankfurt...
A world without Germany or without romantic nationalism in general, or in which romantic nationalism only lives on in the hearts of political radicals... and if a social revolution were to erupt in France, the radicals in the Rhineland would have to choose between their radicalism and their separatism. Of course I'm not really talking about Britain anymore but as for them, in a world where the French Republic technically survives (even in some authoritarian form) might this serve as a flag for reformism and radicalism in Britain itself? Supporting the "French way of things" wouldn't necessarily have to be unpatriotic if Britain and France are not in a generational war...
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Does anyone know if the sister republics have to use the Republican calendar as well?