The United Nations was formed to prevent future wars and to consider when the use of force is permissible, or when peaceful attempts to make change appropriate. International organizations strive, in part, to maintain security by helping countries balance the need of economic security and military power. The United Nations organization was created in October of 1945 to prevent future wars. Initially, it was comprised of 51 member states, principally the victors of World War II. The Charter it adopted called for states to cooperate when dealing with threats (military, principally) posed against its members by outside aggression. This United Nations rule was instituted to prevent sovereign states from arbitrarily using force against each other. It was thought that such a rule would keep future generations from facing the deadly effects of war. At the time that this was adopted, the world had endured two major World Wars, which had destroyed generations, countries and entire communities. As also understood from the information given, the correct answer is E.