What was the main purpose of one of the first world organizations, the league of nations

The main purpose was to help maintain world peace and security. The League of Nations did not work out and was terminated April 20, 1946.

The League of Nations was an international diplomatic group developed after World War I as a way to solve disputes between countries before they erupted into open warfare. A precursor to the United Nations, the League achieved some victories but had a mixed record of success, sometimes putting self-interest before becoming involved with conflict resolution, while also contending with governments that did not recognize its authority. The League effectively ceased operations during World War II.