Rest assured, there will be no chapter on the alt-American Revolution. That would be a big and ambitious project that I don’t really want to tackle for this TL. But the question of whether there is an American Revolution is important enough for world history that it does need to be answered, and I ought to justify that decision sufficiently for it to seem plausible.
Anway, two thoughts on American stuff:
1. It seems to me that American fears about France are not likely to be significant ITTL. France’s holdings in North America now consist only of the Louisiana territory, which is very sparsely populated, and Ile Saint-Jean (PIE), which is a good fishing base (and probably flooded with Acadian exiles right now) but is probably indefensible. Everything else, including the contested territories of the Ohio Valley, is in British hands. Given this situation, it’s hard to see France posing any threat to the Thirteen Colonies at all. If an Anglo-Bourbon war did break out, I suspect France’s focus would not be on trying to reclaim Canada, but on making gains in more profitable theaters like the West Indies, the Mediterranean, and India - in other words, exactly those places they targeted during the OTL American Revolution.
2. Speaking of an Anglo-Bourbon War, on further consideration I think I may be wrong about the prospect of such a war breaking out in the late 60s/early 70s. It’s true that both Spain and France are in a better position than they were during OTL’s 1770 Falklands Crisis, and Carlos in particular is really eager for war. The problem is that, in the end, it’s all up to one man - Louis XV - who was decidedly not a warmonger. The argument that France will be more likely to go to war because of its better financial situation holds water only if France’s finances are the reason Louis declined to go to war over the Falklands Crisis. If, on the other hand, the king’s reasons for avoiding war were personal, religious, moral, or something else, then the precise amount of outstanding French debt is of no consequence.