The Aristocratic Republic and Oncenio (1895-1930):
Piérola government (actually second, because it was an unfortunate de facto president during the war) reorganized and cleaned up the Peruvian public finances, promoting savings, banking and industry, and fighting corruption. Increased employment and a new era of prosperity began for the State. It's called Aristocratic Republic, where members of the social elite would rule from 1899 to 1919 in peace and economic growth. The Democratic government of Guillermo Billinghurst both the civilian and José Pardo y Barreda were probably the most notable.
Social movements have been better organized in those years in Peru. The struggle for the eight-hour day of work (legal framework which had been given by Billinghurst), the founding of Communist parties and the little known Aprista peasant revolts in the southern highlands (generated by the abuses of large estates ) generated an active political life.
The growing unrest paved the way for the interruption of democracy through a coup of former civilian and former finance minister Augusto B. Leguía who would continue the economic policies of his predecessors but with strong populist touch.
On August 28, 1929 rejoins Tacna to Peru.