The First World War encouraged the world to invest in an international organisation to deal with conflict. Many believed that such an organisation would help the world avoid war. As a result, the League of Nations was born. However, despite its initial success, it could not prevent the Second World War (1939-45). Many more people died and were wounded in this war than ever before. The UN was founded as a successor to the League of Nations.

Who were the big three at the Yalta Conference?

Roosevelt, Churchill and Stalin

1945 February: Yalta Conference of the ‘Big Three’ (Roosevelt, Churchill and Stalin) decides to organise a United Nations conference on the proposed world organisation