The mandate system was established by the League of Nations after World War I. The system was established to set regulations pertaining to territories transferred between countries.
The mandate pertained to territories once controlled by states that saw defeat during World War I, mainly Imperial Germany and the Ottoman Empire. Put into place on June 28, 1919, the mandate was placed under Article 22 of the covenant of the League of Nations. This mandate was a compromise between the Allied Powers in which the two territories were distributed among them due to their aim to stick with the pre-Armistice declaration made in 1918. In 1946, the UN Trusteeship System replaced the mandate system since the commission formed by the League of Nations had trouble enforcing it.