During the 1880s, Brazil continued to prosper and social diversity increased markedly, including the first organized push for women's rights. On the other hand, letters written by Pedro II reveal a man grown world-weary with age and having an increasingly alienated and pessimistic outlook. He remained respectful of his duty and was meticulous in performing the tasks demanded of the imperial office, albeit often without enthusiasm. Because of his increasing "indifference towards the fate of the regime" and his lack of action in support of the imperial system once it was challenged, historians have attributed the "prime, perhaps sole, responsibility" for the dissolution of the monarchy to the Emperor himself.