Austria–Hungary and new states that emerged in 1918.
Austria-Hungary or the Austro-Hungarian Empire was a state in Central Europe from 1867 to 1918. It was the countries of Austria and Hungary ruled by a single monarch. The full name of the empire was "The Kingdoms and Lands Represented in the Imperial Council and the Lands of the Crown of St. Stephen".
The dual monarchy replaced the Austrian Empire (1804–1867). It started with the compromise between the ruling Habsburg dynasty and the Hungarians. It was an empire made up of many different peoples and great power. It found its political life full of arguments between the eleven main national groups. It had great economic growth through the age of industrialization. It also saw social changes with many liberal and democratic reforms.
The Habsburg dynasty ruled as emperors of Austria over the western and northern half of the country and as kings of Hungary over the Kingdom of Hungary. The Kingdom of Hungary had some ability to govern itself. It also had a say in things that affected both it and the rest of the empire. This was mainly foreign relations and defense.
The empire's capital was Vienna. Austria-Hungary was the second largest country in Europe (after the Russian Empire). It had the third most people (after Russia and the German Empire).