Final answer:
The League of Nations was created to promote global security and prevent future wars through collective actions, but it failed due to lack of military power and cooperation from member nations.
Step-by-step explanation:
The purpose of the League of Nations was to promote global security and prevent future wars through collective actions of its member nations. It was created after World War I to facilitate good relations among countries and deter aggression by using the principle of collective security, where member states would jointly retaliate against aggressive actions by another state. However, the League of Nations failed because it lacked the military power and full cooperation of member nations to effectively carry out its rulings. Expansionist powers like Japan, Germany, and Italy withdrew from the League, and it was largely ineffective in preventing conflicts between nations, ultimately leading to World War II.