League of Nations mandate was a legal status for certain territories transferred from the control of one country to another following World War I , or the legal instruments that contained the internationally agreed-upon terms for administering the territory on behalf of the League of Nations . These were of the nature of both a treaty and a constitution , which contained minority rights clauses that provided for the rights of petition and adjudication by the International Court . The mandate system was established under Article 22 of the Covenant of the League of Nations , entered into force on 28 June 1919 . With the dissolution of the League of Nations after World War II , it was stipulated at the Yalta Conference that the remaining Mandates should be placed under the trusteeship of the United Nations , subject to future discussions and formal agreements . Most of the remaining mandates of the League of Nations ( with the exception of South-West Africa ) thus eventually became United Nations Trust Territories
Yalta Conference
Yalta Conference
League of Nations mandate