Coup Atlas Research Database
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14504191959AttemptedDissident coup

Bolivia, 1959 — dissident coup attempt

Bolivia (BOL)South America, AmericasApril 19, 1959

Event Summary

On 19 April 1959 the Bolivian Socialist Falange launched a second rising in La Paz against President Hernan Siles Zuazo, which ended in a failed assassination attempt on the president and a bloody suppression that killed 22 people and led to the death of the FSB's founding leader Oscar Unzaga de la Vega. The revolt came six months after the Falange's failed October 1958 attempt, amid the continuing economic hardship and factional strife of Siles Zuazo's first term. Unzaga died during the failed coup, in circumstances officially reported as suicide but long disputed by his party, and his death cost the Falange much of its momentum.

Siles Zuazo survived and governed to the end of his term in 1960, when Victor Paz Estenssoro returned to the presidency, and the MNR held power until the military coup of November 1964.

Researched Details

Researched

Independent research, added record by record. Hover any label for what it means.

Target identified in Coup Atlas research: President Hernan Siles Zuazo survived the assassination attempt and governed to the end of his term in 1960
RESEARCHED NAME
Key figures
Hernan Siles Zuazo (president of Bolivia, target)
Bolivian Socialist Falange (FSB, plotters)
Oscar Unzaga de la Vega (FSB leader, died in the failed coup)

Sources

A second attempted coup by the Falange on 19 April 1959 ended in a failed assassination attempt against Siles Zuazo, and the subsequent massacre resulted in many deaths and the death of Oscar Unzaga, the FSB leader.
SOURCE REVIEWED Wikipedia, Coups d'etat in Bolivia open source ↗
The government suppressed a rebellion by the Falange in La Paz on April 19, 1959, resulting in the deaths of 22 individuals.
SOURCE REVIEWED University of Central Arkansas DADM Project, Bolivia 1917 to present open source ↗
The FSB lost momentum after the death of its undisputed leader Oscar Unzaga during the failed coup in 1959.
SOURCE REVIEWED Wikipedia, Bolivian Socialist Falange open source ↗
After Siles' term ended in 1960 Estenssoro was again elected president, and the MNR government lasted until the coup of 4 November 1964.
SOURCE REVIEWED Wikipedia, Hernan Siles Zuazo open source ↗

Editorial Note

Date match, documented. Dataset codes it a dissident coup, reflecting the FSB opposition rising. Third of the three MNR era Bolivia attempts enriched in this batch, after the May and October 1958 risings.

Cross-Reference

Only one dataset carries it. One of the three reference datasets we check against carries this event; the others do not list it. That is not a contradiction — the datasets cover different periods and use different thresholds — but it means the record has had less outside corroboration.

Identifiers for finding this same event in the other datasets:

Cline Center id
14504191959

How the match is made is described in crossref-report.md.

Outcome and Target

Coup Atlas research identifies the target as: President Hernan Siles Zuazo survived the assassination attempt and governed to the end of his term in 1960.

Baseline coding: Coup attempt failed to remove the incumbent. Recorded leader fate: remained in office; not physically harmed. The baseline file does not name individual targets; researched names are kept in a separate layer.

Baseline Dataset Citation

Cline Center Coup d’État Project Dataset, v2.2.2
Peyton, Buddy, Joseph Bajjalieh, Michael Martin, and Andrea Gerald. 2026. Cline Center Coup d’État Project Dataset. Cline Center for Advanced Social Research. V.2.2.2. February 17. University of Illinois Urbana-Champaign. doi: 10.13012/B2IDB-9651987_V10
⚑ This citation establishes the coded baseline record; use the claim-level sources above for the researched narrative.

Baseline Source-Document Entries

Powell and Thyne

Named in the baseline source document; no article citation was recorded.

The Sun

“216 Are Held In Plot, Bolivian Regime Says,” April 25, 1959

This is the citation trail carried by the baseline dataset, grouped by outlet and rejoined from the line-wrapped original. Coup Atlas has not independently re-checked every document; read the original before citing a specific claim. URLs the import damaged beyond safe repair are shown as plain text and listed in citations-report.md. How this list is built →

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