Nevertheless, these powers were unable to stop the outbreak of the Second World War, so the United Nations (UN) was established following that war in a renewed attempt to prevent international aggression through declarations of war.
Disse kunne dog ikke forhindre 2. verdenskrig, og efter krigen blev de Forenede Nationer oprettet i stedet i et forsøg på at forhindre international aggression gennem krigserklæringer.