You should never be able to take Canada when defeating UK and France unless you have troops in Canada. The Allies faction should disband and only capitulated countries should be available for annexation, as in Kaiserreich. Countries that have your troops in them should leave the faction but continue the war individually. Other countries should white peace. Defeating UK, France and the Netherlands and magically puppeting Australia, the Raj and the DEI doesn't make sense. The UK should exile to Canada and wait for the USA to join the war to recover Great Britain with their help. There could be an achievement with it, similar to the Netherlands one.