The war started after Daza broke a promise by raising taxes on a foreign-owned nitrate company, a move he would regret following the occupation of the entire province of Antofagasta by Chile.  
The treaty ending this war stipulated that plebiscites would be held in the provinces of Tacna and Arica ten years later, though that did not occur for another 46 years. That treaty, signed at Ancon, forced the capitulation of this conflict's instigator, president Hilarion Daza.  The war started after Daza broke a promise by raising taxes on a foreign-owned nitrate company, a move he would regret following the occupation of the entire province of Antofagasta by Chile.  FTP, name this war that saw Chile occupy much of Peru and Bolivia, taking away all of Bolivia's namesake coastline.
The treaty ending this war stipulated that plebiscites would be held in the provinces of Tacna and Arica ten years later, though that did not occur for another 46 years.
War of the Pacific or Guerra del Pacifico or Guano War