This is a map I remade showing the partition of France in a world where the English Commonwealth survived. This scenario is implausible but I made this only for the looks for it's been a while since I made a map this detailed.
Besides The Commonwealth still existing, France managed to put down it's revolution and thus was still a kingdom. As France spend more time colonizing and empire building, the Commonwealth was more of an isolated state. It held control over the British Isles and parts of North America but it was never so successful as France. The Commonwealth & France were rivals during the late 19th century but even The Commonwealth's leaders knew that it would be foolish to wage open war. A shockwave however went trough the commonwealth as it heard that Prussia (soon to be Germany) defeated France and had taken control of territories along the border. Weary of the new Empire but in need of a strong ally, The Commonwealth signed a friendship pact with the Germans. With this new ally they could slowly gain ground on France if the opportunity arose. And it did, on the 28th of june 1914, Franz Ferdinand heir to the Habsburg throne was shot in Sarajevo by a
Serbian Nationalist. War had erupted across Europe. Weary of the Germans, the French Launched an attack trough Belgium* and along the Rhine border.
Later that day the Commonwealth received an message from the Germans. This was the chance they been hoping for to deal with their old rivals once and for all. For many years now The Commonwealth was building up it's army and war industry. This finally could come to good use. As soon as their armed forces were ready, they attacked. Launching attacks along the Normandy coast, Commonwealth troops started to pour into the North of France. After grueling years of wars, France and it's allies were defeated. At the peace talks in Versailles, Germany and especially The Commonwealth wanted to disarm the French once and for all. Besides France having to pay huge restoration fees to everyone involved, They also had to let go of huge swats of land. In the north of France, a Commonwealth puppet state was founded. Breton's and Occitanians got their own state. The Burgundy region became a German puppet state. The rump state became the French Republic.
*I'm aware that this brief description is glaringly incorrect. Since it's pretty hard to account for the existence of Belgium within this. There are also other inconsistencies. I only wanted to sketch out a scenario to go with this map.