All events · Empire, Clearance and Removal

The War of the Triple Alliance and the Destruction of Paraguay

1864–1870 · Americas

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What happened

The war that began in late 1864 between Paraguay and the alliance of Brazil, Argentina and Uruguay ended in March 1870 with the death of Marshal Francisco Solano Lopez at Cerro Cora and the occupation of the country. It is generally regarded as the deadliest interstate war in Latin American history, and the scale of Paraguay's population loss is fiercely disputed: a 1999 study by Thomas Whigham and Barbara Potthast using a recovered 1870 census concluded the country lost around 60 per cent of its people, while Vera Blinn Reber had earlier argued for a far smaller loss, and both positions remain in print. Civilians were mobilised and evacuated inland, and mortality from disease, starvation and exposure during the long retreat exceeded battlefield deaths. Paraguay ceded about 140,000 km2 to its neighbours and was occupied until 1876. The atlas's Americas coverage jumped from the 1840s to the 1900s in South America outside the Southern Cone frontier wars; this fills the largest gap.

Parties

Brazil, Argentina and Uruguay fought Paraguay to the destruction of its army and government, occupied the country and annexed disputed territory

Disputed

The denominator

Paraguay held no reliable census. Reconstructions from the 1846 population register by Whigham and Potthast put the pre-war population at roughly 420,000-450,000, against older claims of 800,000 to 1.3 million; the 1870-71 post-war count found about 116,000-231,000 survivors. Their 'Paraguayan Rosetta Stone' argues for a loss of around 60 per cent of the population and 90 per cent of adult men, while lower estimates put mortality nearer 20 per cent.

Where the baseline comes from

• Paraguayan War — Wikipediaopen-edited
• Demographics of Paraguay — Wikipediaopen-edited

On the death toll

The low end follows Vera Blinn Reber's 1988 reconstruction, which posits a smaller pre-war population and a loss of 8-18 per cent; the high end follows Whigham and Potthast's reading of the 1870 census, implying that 60 per cent or more of Paraguayans died. The disagreement is entirely about the pre-war population baseline and the completeness of the 1870 enumeration. Most deaths were from disease, starvation and exposure rather than combat.

Documented forms of violence

Allied and Paraguayan military correspondence and the accounts of foreign observers with both armies record the destruction of towns, the executions ordered by Lopez during the retreat, and mass civilian starvation.

Movements mapped

• Civilian population retreating inland with the Paraguayan army

Countries touched, on present-day borders

Paraguay

Sources

• Paraguayan War — Wikipediaopen-edited
• Paraguayan War casualties — Wikipediaopen-edited
• The Paraguayan Rosetta Stone: New Insights into the Demographics of the Paraguayan War, 1864-1870 — Latin American Research Reviewscholarly