I agree with Omega. Prussia and Russia are too proud to give an inch of ground to the French, and any invasion of the Amazon basin is doomed to failure. Great Britain's fate may be uncertain, though. Its main islands are perilously close to their much larger nemesis, and their colonies seem ready to at least suffer heavily at the hands of the faux-Central Powers.
And as for Owen Glyndwr... I don't really have an answer to that. This is really my first attempt at an alternate history. In any case though, as I've said, I was aiming more for an interesting scenario than a realistic one. I'll keep your advice in mind in the future.
Well, remember that most of Canada is English. While Québec is most happy being with France, pretty much everywhere else would be pissed off, just like French Canada is today. A war between the two powers would most likely get them to wave the Union Jack. This, with American support, would kick the Frenchies out of Canada. And the rest of French America is just natives. Besides Little Bighorn, we
massacared the natives. That only leaves the Aztecs left, and well, just listen to the second line of the Marine's Hymn. That gets rid of one freaking continiet. Asia's in the bag, as well. Again, Britain has more allies, the better China, I can most definitely see diplomats going to Japan and saying "Look at French Indochina. That's going to happen to you if you don't fight the Franks with us".
Secondly, Great Britain has the pond protecting them from France, and in between the pond is the traditionally strongest but most definitely even-now proudest navy in the world. Plus with the Germans and Russians, would France really have the manpower to invade their rivals? Meanwhile, Britain actually would, and we can see a repeat of the 100 Year's War, only with a British victory and Prussian (Or, I guess at this point, German) support.