The Treaty of Trianon was signed on June 4, 1920, as part of the peace settlements following World War I. It primarily affected the Kingdom of Hungary, which lost about two-thirds of its territory and a significant portion of its population. The treaty was negotiated at the Palace of Trianon in France and aimed to redraw national borders in Central Europe. As a result of the treaty, Hungary was reduced to a much smaller state, with territories ceded to neighboring countries like Romania, Slovakia, and Serbia. The treaty caused lasting political and social tensions in the region, influencing Hungarian national identity and relations with its neighbors for decades.