the conciliation policy had given rise to the Progressives. The ultraconservatives led by Eusébio, Uruguai and Itaboraí who opposed conciliation in the 1850s had nonetheless believed that the Emperor was indispensable to the functioning of the political system: the Emperor was an ultimate and impartial arbiter when political deadlock threatened. By contrast, this new generation of ultraconservatives had not experienced the Regency and early years of Pedro II's reign, when external and internal dangers had threatened the Empire's very existence; they had only known prosperity, peace and a stable administration. To them—and to the ruling classes in general—the presence of a neutral monarch who could settle political disputes was no longer important. Furthermore, since Pedro II had clearly taken a political side on the slavery question, he had compromised his position as a neutral arbiter. The young ultraconservative politicians saw no reason to uphold or defend the Imperial office. Paraguayan War As the threat of war with the British Empire became more real, Brazil had to turn its attention to its southern frontiers. Another civil war had begun in Uruguay turning its political parties against each other. The internal conflict led to the murder of Brazilians and looting of their property in Uruguay. Brazil's government decided to intervene, fearful of giving any impression of weakness in the face of conflict with the British. A Brazilian army invaded Uruguay in December 1864 beginning the brief Uruguayan War, which ended on 20 February 1865. Meanwhile, in December 1864 the dictator of Paraguay, Francisco Solano López took advantage of the situation to establish his country as a regional power. The Paraguayan army invaded the Brazilian province of Mato Grosso (currently the state of Mato Grosso do Sul), triggering the Paraguayan War. Four months later, Paraguayan troops invaded Argentine territory as a prelude to an attack upon the Brazilian province of Rio Grande do Sul. Decline The weaknesses in the monarchy took many years to become apparent. Brazil continued to prosper during the 1880s, with the economy and society both developing rapidly, including the first organized push for women's rights (which would progress slowly over the next decades). By contrast, letters written by Pedro II reveal a man grown world-weary with age, increasingly alienated from current events and pessimistic in outlook. He remained meticulous in performing his formal duties as Emperor, albeit often without enthusiasm, but he no longer actively intervened to maintain stability