What powers did the League of Nations have/not have?

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.