Mandate System
League of Nations mandate - Wikipedia
The mandate system was established by Article 22 of the Covenant of the League of Nations, drafted by the victors of World War I.
The article referred to territories which after the war were no longer ruled by their previous sovereign, but their peoples were not considered "able to stand by themselves under the strenuous conditions of the modern world".
The article called for such people's tutelage to be "entrusted to advanced nations who by reason of their resources, their experience or their geographical position can best undertake this responsibility".
U.S. President Woodrow Wilson and South African General Jan Smuts played influential roles in pushing for the establishment of a mandates system.[5]
The mandates system reflected a compromise between Smuts (who wanted colonial powers to annex the territories) and Wilson (who wanted trusteeship over the territories).
The United States never joined the League of Nations.