what could be the possible events that took place which led them to establish this organization?
The "First World War".
League of Nations
It was founded on 10 January 1920 following the Paris Peace Conference that ended the First World War, and ceased operations on 20 April 1946. 
who is the founder of the league of nations The U.S. President in 1919, "Woodrow Wilson". when was it founded? 10 January, 1920. why type of body is this? It is an intergovernmental organisation. list some of the countries that were a part of this organization. Egypt, Costa Rica, Brazil, Haiti and Iraq were some of them. what is the symbol of this organization? It is a semi-official emblem for the League of Nations emerged: two five-pointed stars within a blue pentagon. They symbolised the Earth's five continents and "five races." A bow at the top displayed the English name ("League of Nations"), while another at the bottom showed the French ("Société des Nations").
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League of Nations [SEP] Introduction
The League of Nations, abbreviated as LON ( , abbreviated as SDN or SdN), was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace. It was founded on 10 January 1920 following the Paris Peace Conference that ended the First World War, and ceased operations on 20 April 1946. The organisation's primary goals, as stated in its Covenant, included preventing wars through collective security and disarmament and settling international disputes through negotiation and arbitration. Other issues in this and related treaties included labour conditions, just treatment of native inhabitants, human and drug trafficking, the arms trade, global health, prisoners of war, and protection of minorities in Europe.