Austria-Hungary, often referred to as the Austro-Hungarian Empire or the Dual Monarchy, was a constitutional monarchy and multinational state in Central Europe between 1867 and 1918. Austria-Hungary was a military and diplomatic alliance of two sovereign states, with a single monarch who was titled both Emperor of Austria and King of Hungary. Austria-Hungary constituted the last phase in the constitutional evolution of the Habsburg monarchy: it was formed with the Austro-Hungarian Compromise of 1867 in the aftermath of the Austro-Prussian War and was dissolved shortly after Hungary terminated the union with Austria on 31 October 1918.
The Central Powers, also known as the Central Empires, were one of the two main coalitions that fought in World War I (1914–1918). It consisted of Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria; this was also known as the Quadruple Alliance.
Charles I or Karl I was Emperor of Austria, King of Hungary, King of Croatia, King of Bohemia, and the last of the monarchs belonging to the House of Habsburg-Lorraine to rule over Austria-Hungary. The son of Archduke Otto of Austria and Princess Maria Josepha of Saxony, Charles became heir presumptive of Emperor Franz Joseph when his uncle Archduke Franz Ferdinand of Austria was assassinated in 1914. In 1911, he married Princess Zita of Bourbon-Parma. He is venerated in the Catholic Church, having been beatified by Pope John Paul II on 3 October 2004, and is known to the Catholic Church as Blessed Karl of Austria.
The Austrian Empire, officially known as the Empire of Austria, was a multinational European great power from 1804 to 1867, created by proclamation out of the realms of the Habsburgs. During its existence, it was the third most populous monarchy in Europe after the Russian Empire and the United Kingdom. Along with Prussia, it was one of the two major powers of the German Confederation. Geographically, it was the third-largest empire in Europe after the Russian Empire and the First French Empire.
The Treaty of Saint-Germain-en-Laye was signed on 10 September 1919 by the victorious Allies of World War I on the one hand and by the Republic of German-Austria on the other. Like the Treaty of Trianon with Hungary and the Treaty of Versailles with Germany, it contained the Covenant of the League of Nations and as a result was not ratified by the United States but was followed by the US–Austrian Peace Treaty of 1921.
The Kingdom of Poland, also known informally as the Regency Kingdom of Poland, was a short-lived polity that was proclaimed during World War I by the German Empire and Austria-Hungary on 5 November 1916 on the territories of the formerly Russian-ruled Congress Poland held by the Central Powers as the Government General of Warsaw and became active on 14 January 1917. It was subsequently transformed between 7 October 1918 and 22 November 1918 into the independent Second Polish Republic, the customary ceremonial founding date of the latter being later set at 11 November 1918.
The Eastern Front or Eastern Theater of World War I was a theater of operations that encompassed at its greatest extent the entire frontier between Russia and Romania on one side and Austria-Hungary, Bulgaria, the Ottoman Empire, and Germany on the other. It stretched from the Baltic Sea in the north to the Black Sea in the south, involved most of Eastern Europe, and stretched deep into Central Europe as well. The term contrasts with the Western Front, which was being fought in Belgium and France.
The Habsburg monarchy, also known as the Danubian monarchy, or Habsburg Empire, was the collection of empires, kingdoms, duchies, counties and other polities that were ruled by the House of Habsburg, especially the dynasty's Austrian branch.
The Oath crisis was a World War I political conflict between the Imperial German Army command and the Józef Piłsudski-led Polish Legions.
The Union of Active Struggle, also translated as Union for Active Struggle and Union for Active Resistance, was a Polish secret military organization founded in June 1908 in Lwów by Józef Piłsudski, Marian Kukiel, Kazimierz Sosnkowski and Władysław Sikorski, all members of the Combat Organization of the Polish Socialist Party in the Kingdom of Poland.
The Republic of German-Austria was an unrecognised state that was created following World War I as an initial rump state for areas with a predominantly German-speaking and ethnic German population within what had been the Austro-Hungarian Empire, with plans for eventual unification with Germany. The territories covered an area of 118,311 km2 (45,680 sq mi), with 10.4 million inhabitants.
Yugoslavia was a state concept among the South Slavic intelligentsia and later popular masses from the 19th to early 20th centuries that culminated in its realization after the 1918 collapse of Austria-Hungary at the end of World War I and the formation of the Kingdom of Serbs, Croats and Slovenes. However, the kingdom was better known colloquially as Yugoslavia ; in 1929 it was formally renamed the "Kingdom of Yugoslavia".
While Poland did not exist as an independent state during World War I, its geographical position between the fighting powers meant that much fighting and terrific human and material losses occurred on the Polish lands between 1914 and 1918.
The General Government of Warsaw was an administrative civil district created by the German Empire in World War I. It encompassed the north-western half of the former Russian-ruled Congress Poland.
The Polish question was the issue, in international politics, of the existence of Poland as an independent state. Raised soon after the partitions of Poland in the late 18th century, it became a question current in European and American diplomacy throughout the 19th and parts of the 20th centuries. Historian Norman Davies notes that the Polish question is the primary lens through which most histories of Europe discuss the history of Poland, and was one of the most common topics of European politics for close to two centuries. The Polish question was a major topic at all major European peace conferences: at the Congress of Vienna in 1815, at the Versailles Conference in 1919, and at the Yalta Conference and the Potsdam Conference in 1945. As Piotr Wandycz writes, "What to the Poles was the Polish cause, to the outside world was the Polish question."
The Ukrainian People's Republic (UPR) was a short-lived state in Eastern Europe. Prior to its proclamation, the Central Council of Ukraine was elected in March 1917 as a result of the February Revolution, and in June, it declared Ukrainian autonomy within Russia. Its autonomy was later recognized by the Russian Provisional Government. Following the October Revolution, the Central Council of Ukraine denounced the Bolshevik seizure of power and proclaimed the Ukrainian People's Republic with a territory including the area of approximately eight Russian imperial governorates. It formally declared its independence from Russia on 22 January 1918.
The United Kingdom declared war on Germany on 3 September 1939, two days after Germany invaded Poland. France also declared war on Germany later the same day.
The dissolution of Austria-Hungary was a major geopolitical event that occurred as a result of the growth of internal social contradictions and the separation of different parts of Austria-Hungary. The more immediate reasons for the collapse of the state were World War I, the 1918 crop failure, general starvation and the economic crisis. The Austro-Hungarian Empire had additionally been weakened overtime by a widening gap between Magyar and Austrian interests. Furthermore, a history of chronic overcommitment rooted in the 1815 Congress of Vienna in which Metternich pledged Austria to fulfill a role that necessitated unwavering Austrian strength and resulted in overextension. Upon this weakened foundation, additional stressors during World War I catalyzed the collapse of the empire. The 1917 October Revolution and the Wilsonian peace pronouncements from January 1918 onward encouraged socialism on the one hand, and nationalism on the other, or alternatively a combination of both tendencies, among all peoples of the Habsburg monarchy.
World War I began when Austria-Hungary invaded Serbia in July 1914, following the Assassination of Archduke Franz Ferdinand. Austria-Hungary was one of the Central Powers, along with the German Empire and the Ottoman Empire. Austro-Hungarian forces fought the Allies in Serbia, on the Eastern Front, in Italy, and in Romania. With heavy aid and support from its allies, the empire managed to occupy Serbia in 1915 and force Romania out of the war in 1917. On the other fronts, it suffered severe casualties, culminating in the collapse of the Italian front, which led the Austrians to accept the Armistice of Villa Giusti on 3 November 1918.
