The First World War caused very deep and fundamental changes in Central and Eastern Europe. The biggest loser of the war was the Austro-Hungarian Monarchy. Kingdom of Hungary as one of its parts was dissolved in the framework of Trianon Peace Treaty. The new Hungary could retain only 28,6% of the former territory and 36,5% of its former population. After 1920 the League of Nations was planned a new collective European security system.
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