We all know that the central powers in WW1 were composed by Germany, Austria-Hungary, the Ottoman empire and Bulgaria. What I've been thinking is: what if Italy, Spain, Romania, Albania, Japan and Siam joined WW1 on the central power side? If I'm correct, all of them had some claims against the Entente. What if this leaded into a central power victory? How would the world look like? What would the map look like? Can someone make a map showing the territorial changes in cause of this central power victory?
Okay, well if it's just these new powers, I would say yes the Central powers will win ww1.
Italy on the side of the Central Powers means Austria-Hungary only needs to focus on Russia, and Serbia, meaning Russia is in a whole new world of hurt with those hundreds of thousands of more troops. France is also screwed because now they have to also fight Italy.
Spain also is gonna screw France with another front. France will lose this war in a year, no question. They can't handle Germany, Italy, and Spain at once.
If Romania joins, Russia is gonna have a thorn on it's back with Romanian troops rushing at the Russians with a surprise attack.
Albania is probably not going to be the most help the Austrians could get, but it does mean Austria can relax more troops in Serbia, and Montenegro.
You would have to change a lot with Japanese history to get them German-allied, but if you do, Japan would probably invade A bit of Russian Siberia, and allied land. Russia already has a lot on it's back, with Germany, Romania, Austria, and the Ottomans coming at them, that it's central allies want it to divert attention away from their fronts, and get more Russians against them. The Japanese would also take a lot of French and British colonies in the Pacific. Indochina though probably isn't going to happen.
Siam is pretty interesting. They'd probably be important to diverting Indian troops away from fronts like Mesopotamia. Although I think it would be fun to get Afganistan, and Siam against India because Germany had sent spies to get the Afghans to go to war with the British. Siam will probably attack Burma, but they might not have much success. They would probably launch an invasion of British Malaysia on Mainland East Asia. Indochina probably would be invaded until they get to the jungle because you just don't invade Indochina ever. They would probably not advance farther into the Jungles but seize important cities, and villages, but they can't advance farther in. I think though it would be a lot harder to advance into Burma.
As for a post-war map, Spain will probably get the rest of the Pyrenes mountains, Italy will probably take some french land gains, Romania will get a ton of land, and economic influence from Breske Litovsk
Albania will probably get a few Montenegran lands and a good chunk of Serbia.
Japan will probably get a good chunk of Russian lands, even Vladivostok, but I don't know what British, or French lands they'd get.
Siam probobly gets a really nice bite of Burma, Indochina, and all of Mainland British Malaysia.