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Successor states

There were two legal successor states of the former Austro–Hungarian monarchy:

The 1919 Treaties of Saint-Germain-en-Laye (between the victors of World War I and Austria) and Trianon (between the victors and Hungary) regulated the new borders of Austria and Hungary, reducing them to small-sized and landlocked states. In regard to areas without a decisive national majority, the Entente powers ruled in many cases in favour of the newly emancipated independent nation-states, enabling them to claim vast territories containing sizeable German- and Hungarian-speaking populations. The Republic of Austria lost roughly 60% of the old Austrian Empire's territory. It also had to drop its plans for union with Germany, as it was not allowed to unite with Germany without League approval. Hungary, however, was severely disrupted by the loss of 72% of its territory, 64% of its population and most of its natural resources. The Hungarian Democratic Republic was short-lived and was temporarily replaced by the communist Hungarian Soviet Republic. Romanian troops ousted Béla Kun and his communist government during the Hungarian–Romanian War of 1919.

In the summer of 1919, a Habsburg, Archduke Joseph August, became regent, but was forced to stand down after only two weeks when it became apparent the Allies would not recognise him. Finally, in March 1920, royal powers were entrusted to a regent, Miklós Horthy, who had been the last commanding admiral of the Austro-Hungarian Navy and had helped organize the counter-revolutionary forces. It was this government that signed the Treaty of Trianon under protest on 4 June 1920 at the Grand Trianon Palace in Versailles, France. The restored Kingdom of Hungary lost roughly 72% of the pre-war territory of the Kingdom of Hungary.