There were many significant political changes which Diocletian enacted. One important thing which happened was that he divided the Roman empire into two parts. This meant Rome was being effectively taken care of by two different emperors at the time for that reason.
Answer: They did not adequately protect Ethiopia.
Explanation:
Emperor Haile Selassie of Abyssinia (modern day Ethiopia) was forced to flee his country when Italy under Mussolini invaded it in 1935 as part of Mussolini's plans to gain more colonies in Africa.
Abyssinia was a member of the League of Nations and expected the League to sort the matter out. The League responded by imposing sanctions on Italy but the main member states such as Britain and France made deals with Italy and undermined the blockade.
Italy completely conquered Abyssinia and this disappointed Haile Selassie who thought that the League would have done more to protect a member state from agrresion.