The Trianon Treaty was signed on June 4, 1920, as part of the post-World War I peace agreements. It primarily affected Hungary, which lost about two-thirds of its territory and significant population to neighboring countries, including Romania, Slovakia, and Serbia. The treaty aimed to redraw borders in Central Europe and establish new nation-states. The treaty was named after the Grand Trianon Palace in Versailles, France, where the signing took place. It was one of several treaties that reshaped Europe after the war, leading to significant political and social changes in the region. The consequences of the treaty still influence Hungarian politics and national identity today.