agreed-upon treaty capacity, the General Assembly affirmed the principles of international law that were recognized by the Charter of the Nuremberg Tribunal and directed that they should be codified. Many of those same principles were subsequently adopted for inclusion in draft treaties that were under development by the International Law Commission of the United Nations. They were also incorporated through the agreement of the High Contracting Parties into the Geneva Conventions of 1949. In 1993 the UN Security Council "acting under Chapter VII of the Charter on the United Nations" established an international tribunal and approved a Statute that had been recommended in a report submitted by the UN Secretary-General. It concluded beyond doubt that the law applicable in armed conflict as embodied in the Geneva Conventions of 12 August 1949 and the Hague Convention (IV) of 18 October 1907 had become part of international customary law, and should be part of the subject matter jurisdiction of the International Criminal Tribunal for the former Yugoslavia. In 1998, the United Nations Diplomatic Conference of Plenipotentiaries approved the Rome Statute of the International Criminal Court. The offenses against unwritten customary international law were amenable to prosecution by international tribunals, like the Nuremberg Tribunal, long before they were codified and incorporated into the subsequent treaties. Conventions, resolutions and declarations Many provisions of international law are based upon principles and norms that were developed in the Americas during the 19th century. They include the principle of uti possidetis of 1810 and the related Monroe Doctrine of 1823, regarding non-colonization and non-intervention. In 1890, the First International Conference of American States adopted a proscription against territorial conquest and agreed upon the non-recognition of all acquisitions made by force. Those principles and regional understandings were recognized in Article 21 of the Covenant of the League of Nations. The system of mandates contained in article 22 of the Covenant was based in part upon those normative declarations and state practices. The Kellogg-Briand Pact of 1928, and the League of Nations approval of the Stimson Doctrine in 1931 were efforts designed to end the practice of coercive territorial revisionism through international law. After World War II, the principles of international law that upheld the territorial integrity of states were incorporated in the Charter of the United Nations, and subsequently reaffirmed in the Declaration on the Granting of Independence to Colonial Countries and Peoples, the Organization of African Unity