The Treaty of Trianon, signed in 1920, held significant implications for Hungary following World War I. It resulted in the dismemberment of the Austro-Hungarian Empire, leading to Hungary losing about two-thirds of its territory and population to neighboring countries, including Romania, Czechoslovakia, and Yugoslavia. This loss fostered deep national resentment and feelings of injustice among Hungarians, which contributed to political instability in the interwar period. Moreover, the Treaty of Trianon limited Hungary’s military capabilities and economic recovery. The repercussions of the treaty influenced Hungarian national identity, politics, and aspirations for territorial revision throughout the 20th century, impacting regional relations in Europe.