An alliance of two years does not a friendship make. Napoleon has held back a bit after his comeback. He has completely ignored Italy and Iberia, prefering not to overextend himself in those theatres. Napoleon had worked well with Prussia in the past, and the long and noble Prussian tradition of oppressing Slavs comes into play here. France is trying to pull Germany over to its side against an overweening Russia. At least, that's how its portrayed. I was hoping to have a Prussia that wants nothing to do with Germany and is much more Germano-Slavic in culture. Believe me, they aren't that enamoured with Napoleon, and if he or any of his descendants slip up they'll 'ave 'em.
Well, although it's true that Prussia and Russia aren't exactly friends, neither side wants to start a war that will completely disrupt the balance of power, and neither does the rest of Europe. If you want a more Slavic Prussia, you might just have a different Congress of Vienna that restores Poland to the partitioning powers, with Prussia gaining West Galicia in exchange for recognising Austrian dominance over Italy and Austrian presidency over the German Confederation. That would satisfy all parties, except possibly Russia, who might be allowed to keep Tarnopol and Bessarabia in exchange.
I'm surprised I didn't say how the war started. I'll change that. But I thought I did discuss the founding of the FRNE. But I am planning on a more extensive piece about New England and its structure soon.
I'm surprised too. You only wrote that the British sent Wellington to fortify the Caribbean against a possible American attack. As for New England, you only wrote that there were many people who called for outright secession, and that the Westmorlanders wanted to join in an eventual rebellion; however, the actual secession of the FRNE from the Union is not stated anywhere.