Answer: The commitment to collective security.
Explanation: That shared commitment to international security and peace was expressed in Article X of the League of Nations charter:
- The Members of the League undertake to respect and preserve as against external aggression the territorial integrity and existing political independence of all Members of the League. In case of any such aggression or in case of any threat or danger of such aggression the Council shall advise upon the means by which this obligation shall be fulfilled.
In addition to the overall goal of collective security, the League of Nations established as its aims disarmament across nations, settling disputes between countries through negotiation, and improving welfare of people around the globe. (The UN today has similar goals.)