1899. The Imperial Republic of Europe holds in her grasp almost half of the entire world, the United States of America stretches from Greenland to Lousiana, and the Empire of the New Spain rules over all former colonies of the old Spain. Can you come up with an AH in which this scenario is remotely possible?
Napoleon succeeds in conquering Russia and manages to consolidate his hold over Europe, eventually absorbing all of the conquests and allies into France, now renamed the Imperial Republic of Europe. His successors further expand with the IRE's immense power base, taking Britain, Africa, etc.
Meanwhile, in Mexico, the old Spanish Monarchy has built up a new empire based around its overseas colonies, with the goal of oneday liberating Europe...
The US took advantage of the fall of Britain to seize Canada. Spain's power centre being focused in SA and Mexico keeps the US from taking California.
Meanwhile, the Ottoman Empire is the last bastion of resistance in the old world.