The Treaty of Saint-Germain was signed on September 10, 1919, following World War I. It officially ended hostilities between the Allied Powers and the former Austro-Hungarian Empire. The treaty aimed to establish new borders and recognize the independence of several nations, including Czechoslovakia, Yugoslavia, and Hungary. The treaty also imposed military restrictions on Austria and required it to renounce any claims to territories that were part of the Austro-Hungarian Empire. Additionally, it addressed issues related to minority rights and the protection of ethnic groups within the newly formed states.