The Treaty of Trianon, signed in 1920, imposed significant territorial losses and restrictions on Hungary following World War I. Hungary lost about two-thirds of its pre-war territory, including regions that became parts of several neighboring states such as Romania, Czechoslovakia, and the Kingdom of Serbs, Croats and Slovenes (later Yugoslavia). Additionally, the treaty limited Hungary's military capabilities and imposed economic reparations. The treaty's harsh terms created a sense of national trauma and resentment among Hungarians, contributing to political instability and revanchism in the interwar period and influencing Hungary's future foreign policy and societal dynamics.