Resolution 21 (1947) approves the terms of a strategic area trusteeship agreement for the Pacific Islands formerly held by Japan under a League of Nations mandate. The resolution designates the United States as the Administering Authority of the Trust Territory, granting it full powers of administration, legislation, and jurisdiction over the islands. The trusteeship agreement requires the United States to promote the political, economic, social, and educational advancement of the inhabitants, protect their rights and freedoms, and maintain the territory for international peace and security purposes.