Alternative History
Alternative History
United Kingdom of Austria and Slovenia
Vereinigtes Königreich Österreich und Slowenien (German)
Združeno kraljestvo Avstrija in Slovenija (Slovenian)
Danubia
Timeline: Triangles and Crosses
OTL equivalent: Austria, Slovenia, Trieste minus the Slovene Littoral, Andaman and Nicobar Islands
Flag of the Habsburg Monarchy Imperial Coat of Arms of the Empire of Austria (1815)
Union flag Coat of arms
Motto: 
Indivisibiliter ac Inseparabiliter
("Indivisibly and inseparably")
Anthem: 
"Gott erhalte, Gott beschütze"
Map of Danubia (TaC)
Map of Danubia
CapitalVienna
Other cities Graz
Leibach
Trieste
Official languages German
Slovenian
Religion Roman Catholicism (official)
Demonym Danubian
Government Federal parliamentary constitutional monarchy
 -  Monarch Charles II
 -  Prime Minister TBD
Legislature Imperial Council
 -  Upper house House of Lords
 -  Lower house House of Deputies
Formation
 -  Holy Roman Empire 800–1806 
 -  Archiduchy of Austria 6 January 1453 
 -  War of Succession 1740–48 
 -  Austrian Empire 11 August 1804 
 -  Congress of Danubia 30 March 1867 
Area
 -  Total 109,446 km2 
42,257 sq mi 
Population
 -  2023 estimate 11,525,491 
Gini (2017) 25.1 (low) 
HDI (2018) 0.917 (very high) 
Currency Austrian krone (K) (ATK)
Time zone UTC+1
Date formats dd/mm/yyyy
Drives on the right
Calling code +43

Danubia, officially the United Kingdom of Austria and Slovenia is a country in Central Europe, lying in the Eastern Alps. Its capital and largest city is Vienna, on the Austrian side. It is bordered by Switzerland to the west, Germany to the northwest, Czechoslovakia to the north, Hungary to the east, Yugoslavia to the southeast, Italy to the southwest. Danubia has access to the sea with the Trieste Corridor, which cuts Italy in half. Danubia also includes the overseas territory of Andaman and Nicobar Islands. The country occupies an area of 109,446 km² (42,257 sq mi) and has a population of 11 million.

The lands that constitute current-day Danubia have been part of the Habsburg realm since the Middle Ages. With the loss of Hungary, Slavonia and Galicia-Volhynia, the country reformed as the Austrian Empire, until it was defeated in the Austro-Prussian War, when it was reformed as the Austro-Danubian Empire. After the World War I, however, it lost the Czech lands that formed part of Czechoslovakia. In 1921, it dropped "Austro" from the name, and elevated the Slovenian lands into Slovenia, forming the United Kingdom. In a treaty established with Italy, the country was provided with access to the sea by Trieste.

With the formation of socialist Germany, Austria hosted the first German government-in-exile, until it was moved to Guinea-Mesurado. In a competition with both states, Danubia also sought to be recognized as the legitimate successor to Germany, until World War II. During the war, the country sided with the Allies, thus being invaded by Yugoslavia. During the Cold War, the country was allied with the Western Bloc. In the meantime, Otto I was monarch of Danubia throughout the rest of the 20th century, ultimately becoming the longest-reigning monarch in recorded history.

Danubia is a parliamentary representative democracy and a constitutional monarchy. It is a founding member of the Society of Nations and the European Community. Vienna is the capital city of the country, it is also of Austria, while Leibach (Ljubljana in Slovenian) is the capital of Slovenia. Other major cities include Graz, Trieste, Linz and Maribor. Both kingdoms have their own devolved governments.