Hungary loses 71% of its territory and 63% of its population when the Treaty of Trianon is signed in Paris.

The Treaty of Trianon, signed on June 4, 1920, was one of the peace agreements that followed the end of World War I. It formally ended the conflict between Hungary and the Allied Powers after the collapse of the Austro-Hungarian Empire. Signed at the Grand Trianon Palace in Versailles, France, the treaty dramatically reduced Hungary’s territory and population. Large areas of land were transferred to neighboring countries such as Romania, Czechoslovakia, and the newly formed Kingdom of Serbs, Croats, and Slovenes. As a result, millions of ethnic Hungarians suddenly found themselves living outside Hungary’s new borders.

The treaty had severe political and economic consequences for Hungary. The country lost around two-thirds of its territory and more than half of its population, including important agricultural land, forests, railways, and industrial regions. Many Hungarians viewed the agreement as deeply unfair and humiliating, creating a strong sense of national grievance that shaped Hungarian politics for decades. The loss of resources and trade networks also weakened the economy, making recovery after the war more difficult. In addition, military restrictions imposed by the treaty limited the size and power of Hungary’s armed forces.

The Treaty of Trianon remains one of the most controversial events in Hungarian history. For many Hungarians, it symbolizes national tragedy and the fragmentation of historic Hungary. The treaty also contributed to political instability in Central Europe during the interwar period, as Hungary sought to revise its borders and regain lost territories. Historians often argue that the resentment caused by Trianon played a role in Hungary’s later alliance with Nazi Germany during World War II. Even today, the treaty continues to influence relations between Hungary and neighboring countries, especially regarding Hungarian minority communities living outside modern Hungary’s borders.