The Treaty of Trianon, signed in 1920, had a profound impact on Hungary, as it resulted in significant territorial losses. Hungary, which had been part of the Austro-Hungarian Empire, lost about two-thirds of its territory and population to neighboring countries such as Romania, Czechoslovakia, and Yugoslavia. This displacement led to a national identity crisis and feelings of injustice among Hungarians. The treaty also restricted Hungary's military capacity and imposed reparations, fueling resentment and nationalistic sentiment. These factors contributed to political instability and the rise of irredentist movements in Hungary, influencing the country’s interwar and post-World War II policies.