The Treaty of Trianon, signed in 1920, holds historical significance as it formalized the end of World War I between the Allies and Hungary. The treaty resulted in substantial territorial losses for Hungary, as it lost over two-thirds of its territory to neighboring countries like Romania, Czechoslovakia, and Yugoslavia. This led to a drastic reduction in Hungary's population and resources, fostering national resentment and contributing to interwar tensions in Central Europe. The treaty's repercussions influenced Hungarian nationalism and the rise of political movements that sought to reclaim lost territories throughout the 20th century.