War of the Pacific Erupts in South America

Context

The Atacama Desert's vast deposits of guano and nitrates had fueled economic rivalries among Chile, Bolivia, and Peru since the mid-nineteenth century. Bolivia and Chile signed a boundary treaty in 1874 that fixed their frontier and barred new taxes on Chilean mining operations in Bolivian territory for twenty-five years. Peru, seeking to protect its own nitrate interests, entered a secret defensive alliance with Bolivia in 1873.

What Happened

Tensions erupted when Bolivia imposed higher taxes on the Chilean-owned Compañía de Salitres y Ferrocarril de Antofagasta in 1878, violating the 1874 treaty. Chile protested and demanded arbitration, but Bolivian president Hilarión Daza rejected the request and threatened to seize the company's assets. On February 14, 1879, Chilean forces occupied the port of Antofagasta without resistance. Bolivia responded by declaring a state of war in early March.

Aftermath

With the secret alliance now public, Chilean president Aníbal Pinto obtained legislative approval and issued Chile's declaration of war on both Bolivia and Peru on April 5. Chilean naval squadrons immediately blockaded Bolivian and Peruvian ports, cutting off supply lines and setting the stage for a series of sea and land campaigns across the Pacific coast and Andean foothills.

Legacy

Chile's victory in 1883–1884 produced lasting territorial changes: Peru ceded the Tarapacá region, and Bolivia lost its entire Pacific coastline, becoming landlocked. The war accelerated Chile's economic rise through control of nitrate exports while deepening regional resentments that shaped diplomacy well into the twentieth century.