1. Factors leading to the creation and successes of the League of Nations (1919–1929) 2. Challenges faced by the League of Nations during the 1930s and its impact (1930–1939) 3. Establishment of the United Nations and its role up to 1964 4. Major challenges faced by the United Nations between 1967–1989 5. The role and effectiveness of the United Nations during global crises (1990–2011)