The main POD is a German victory in the first battle of the Marne, and a consequent withdrawal of France from the war. This allowed a focus on the eastern front leading to a CP victory in the war. Italy was kept out of the war by A-H succeeding the Trento region.
After the defeat of Russia several new states were created, those on the map being Poland, Belarus and the Ukraine. Romania also gained Bessarabia due to its joining the CP against Russia. A-H also gained control over the Caucasus region as its sphere of influence, which played into its use of population transfers.
Both Greece and Bulgaria got caught up in the collapse of the Ottoman Empire with Territorial gains. Greece gained control over southern Thrace as well as large stretches of the Anatolian coast line. Bulgaria (which did not join the CP) agreed to give Greece its land on the Aegean Sea in exchange for northern Thrace and free access through the Straits for its shipping and navy guaranteed by Germany.
A-H also found itself forced to give Poland (under a personal union with Prussia) Galicia. It also gifted Romania Bukovina given its untenable position as A-H only possession beyond the Carpathian Mountains. The Germans and Ukrainians of Bukovina were moved to the new Caucasus state. In their place around 450.000 Romanians were moved from Hungary to the region.
Of particular concern to Germany was that the Austrian portion of the monarchy needed to continue to dominate the triple monarchy. Therefore it “suggested” serval ideas to reforming the monarchy.
Firstly Hungary gave the three counties of Moson, Sopron and Vas and the city of Pressburg to Austria as the duchy of Vierburgenland. It also ended its personal union over Croatia and Slavonia and its control over Illyrian Banat to the new state of Illyria. In terms of demographics Hungary changed substantially, due to loss of land as well as attempts at population transfers. Previously Hungarians had made up only 48% of the population but now totalled 66% of the population. The entire Romanian populations of the counties Bihar and Kolozs (around 450.000 people) were relocated to Bukovina. In their place the approximately 450.000 Hungarians of Vierburganland were settled in the region. This also cut the Romanian portions of Transylvania in two and connected the Székely Land to the main region of Hungarian speakers. The capital of Transylvania (Klausenburg) also became an almost entirely Hungarian speaking city. The 2 million strong German populations were also moved back to the Austrian portion of the monarchy, the empty land was typically then populated by surrounding ethnicities apart from the regions of Hungarian Banat and the German speaking regions south of the Székely Land. This land was reserved for Hungarian soldiers and their families as a reward for their service in the war. As a whole the Hungarian monarchy opposed the territorial concessions it had to make, however it has used it as an opportunity to further Magyarize the population. It is also very clearly plays the role of second fiddle to the Austrian portion of the monarchy.
As for Illyria it was made up of Croatia and Slavonia, Dalmatia, Bosnia and Herzegovina, Serbia, Illyrian Banat, Montenegro and Albania. A-H was given the territories of Serbia, Albania and Montenegro as compensation for the loss of Galicia and Bukanovia. Sarajevo was made the capital as it was seen as the best location to balance the interests of the Serbians and Croatians. Albania and Macedonia were turned into an autonomous region, much like Galicia, given the particularly stark linguistic and cultural difference of the region to the rest of Illyria. The language of Serbo-Croatian was also officially termed Illyrian. The use of Cyrillic script was also banned and Latin script is used for all official purposes. The Croats tend to dominate the state, but are under pressure from Vienna to put aside past differences and embrace their new Illyrian identity. The Serbs are not happy with the situation but there is not much they can do about it, other than wait until they can attempt to gain the dominate position in Illyria. On the other hand the Albanians are happy to be part of a greater Albania, albeit under Austrian leadership. The Macedonians are as they always have been, under someone else’s control and not happy about it. As for its position of power in the monarchy it is very much the more junior of the three.
For the Austrian third of the monarchy, things are looking good. The influence of Germany and the victory of the Great War has led to its position as head honcho in the monarchy being nigh upon unquestionable, despite its loss of Galicia, Bukanovia and Southern Tirol. Demographically it has embraced resettlement policies to the Caucasus. The resettlements of around 2 million Germans from Hungary were distributed as follows. Firstly 700.000 were settled in Vierburgenland. Second the 400.000 Germans were settled in Austrian Silesia. 500.000 Germans were settled in the place of the Italians and Illyrians in Küstenland. A further 200.000 were settled in southern Steiermark and the final 200.000 were settled in the Krain predominantly in the Laibach area. In each of these areas the corresponding number of Czechs, Illyrians, Italians and Slovenes were resettled in the Austrian controlled Caucasus. The 230.000 Poles of Silesia were resettled in eastern Galicia. This meant that Germans made up 57% of the population of the Austrian third of the monarchy. It is also embarking on a renewed crusade of Germanisation, with deportation of non-German criminals to the Caucasus becoming a normal punishment for a large number of offensives.
Overall A-H-I is in a period of relative stability. For the moment it has control over its various ethnic groups and has a relatively prosperous economy, alongside a sphere of influence over the Caucasus. However this is very reliant on German domination over Central and Eastern Europe and the moment Germany feels like withdrawing it support to the Triple Monarchy things are very likely to go pear-shaped, with unruly minorities and jealous neighbours. There is always the threat hanging over Vienna that if it steps out of line German troops would be parading in Vienna a week later proclaiming the Großdeutsche Lösung. So while A-H-I enjoys the good times, surviving the bad times will be a matter of German good will.