This document contains definitions of key terms related to the United Nations and international organizations. It defines the League of Nations as the organization created after WWI to bring leaders together to discuss differences, but it was unsuccessful at achieving its goals. It also defines the United Nations as the international organization formed in 1945 to increase political and economic cooperation between member countries. Additionally, it provides definitions for terms like the UN Security Council, sanctions, the Big Three leaders who helped establish the UN, and other important figures and components related to the UN and international diplomacy.