Write a realistic, sensible, plausible and alternate history scenario in the form of a historical documentary book chapter set in the world of the alternate historical scenario with no references to this being an alternate history scenario or to the real world timeline at all  in which after the collapse of the Berlin Wall separating the federal constitutional parliamentary republic of the Federal Republic of Germany in West Germany from the Soviet puppet state of the far-left communist, Marxist-Leninist Socialist Unity Party of Germany-ruled dictatoral communist republic of the German Democratic Republic in East Germany in 1989,  and the subsequent reunification of Germany via the absorption of the GDR into the FRG after the collapse of the Berlin Wall the post 1871, pre 1919 German Royal House of Hohenzollern-ruled federal parliamentary semi-constitutional royal monarchy of the Kingdom of Prussia ruling over much of modern-day eastern Germany and Western Poland along with Russian Kalingard-dominated Federal parliamentary semi-constitutional monarchy of the German Empire is [the German Empire] restored [the German Empire] as the government [the German Empire] of post Berlin War Germany with its [the German Empire's] pre-1919 territorial integrity  restored, [the German Empire being restored as the government of post-Berlin Wall Germany] due to a series of loopholes in the "2+2" Treaty, with both the USA and the USSR having to withdraw their [the USA's and the USSR's] respective militaries, the combined land warfare, aerial combat and naval warfare forces of the USA, the US Armed Forces, and the combined ground combat, aeiral warfare and naval warfare division of the Soviet government, the Soviet Armed Forces, from the newly restored German Empire. 

The Germans then restore the German Empire's unified ground and air force, the Imperial German Army from the FRG's unified armed forces, the Bundeswehr [Federal Defence |Bundeswehr|] and the GDR's armed forces, the Nationale Volksarmee [National People's Army |Nationale Volksarmee|].

After the series of separate but related ethnic conflicts, wars of independence, and insurgencies that occurred in the far left, Communist, anti-Stalinist social patriotic League of Communists of Yugoslavia-ruled Federal Marxist–Leninist one-party parliamentary socialist republic of the Socialist Federal Republic of Yugoslavia ruling [the SFR Yugoslavia] over Slovenia, Croatia, Bosnia and Herzegovina, Macedonia and Kosovo from [the SFR Yugoslavia's homebase] Serbia, [the Yugoslav Wars in the SFR Yugoslavia] from 31 March 1991 – 13 August 2001 come to an early end in the early 1990s due to joint US-German collaboration against the by now Serbian ultranationalist, Serbian Orthodox supremacist, anti-Croat, anti-Bosnian dominated combined armed forces of the SFR Yugoslavia, the Yugoslav People's Army,

The Swiss-German Imperial House of Hapsburg-Lorraine ruled Federal parliamentary constitutional imperial royal monarchy of the Austria-Hungarian Monarchy/Austria-Hungarian Empire ruling [the Austria-Hungarian Monarchy/Austria-Hungarian Empire] over Illryia [Croatia and Bosnia and Herzegovina], Greater Hungary [Hungary, Bačka, Baranja, Međimurje, Vojvodina and Prekmurje in Serbia, Transylvania and most of the Banat in Romania, Carpathian Ruthenia in Ukraine, Slovakia and Poland], Bohemia and Moravia [Czechia and Slovakia] and Galicia-Lodomeria in Ukraine from [the Austria-Hungarian Monarchy's/Austria-Hungarian Empire's stronghold and homebase] Greater Austria [Austria, Slovenia, South Tyrol] is [the Austria-Hungarian Monarchy/Austria-Hungarian Empire] restored [the Austria-Hungarian Monarchy/Austria-Hungarian Empire] as the government [the Austria-Hungarian Monarchy/Austria-Hungarian Empire] of its [the Austria-Hungarian Monarchy's/Austria-Hungarian Empire's] pre-WW1 territories [Greater Austria, Illyria, Greater Hungary, Bohemia and Moravia and Galicia-Lodomeria]   due to the discovery in the now retrieved archives in the now-ex Yugoslavia that Serbia started WW1 and Poland started WW2.

The Germans and Austria-Hungarians then enforce the Treaty of Brest-Litovsk on the weakened Soviet Union, with the restored German Empire restoring the North German-Slavic House of Mecklenburg-ruled absolute feudal royal monarchy of United Baltic Dutchy in Estonia and Latvia, [the restored German Empire restoring] the House of Mecklenburg's cadet branch of the House of Urach-ruled constitutional parliamentary royal monarchy of the Kingdom of Lithuania in Lithuania, [the restoredGerman Empire] restored the German House of Hohenzollern-ruled constitutional parliamentary royal monarchy of Kingdom of White Ruthenia in Belarus, [the restored German Empire restoring] the Ukrainian House of Skoropadsky-ruled constitutional parliamentary royal imperial absolute monarchy of the Ukrainian State/Second Ukrainian Hetmanate in Ukraine minus Donbass, [the restored German Empire] forming the Swedish-Russian House of Rurikid-ruled Don Kuban Union in Russia's Don and [Russia's] Kuban regions along with the Ukrainian Donbass region, [the restored German Empire] restoring the hereditary royal absolute tribal Buddhist monarchy of the Kalmyk Khanate in Kalmykia and [the restored German Empire restoring] the Kingdom of Georgia under a side-branch of the Kingdom of Italy's royal family, the German-Italian House of Savoy in Georgia. 

The Austria-Hungarian Monarchy/Austria-Hungarian Empire also restores the constitutional parliamentary royal monarchy of the side branch of the House of Hapsburg-ruled Kingdom of Poland in Poland proper.