Argentina (ARG)South America, AmericasJune 28, 1966
Event Summary
On June 28, 1966 a military junta styling itself the Argentine Revolution overthrew constitutional President Arturo Illia and installed General Juan Carlos Ongania as de facto president, opening a dictatorship that ruled until 1973. Illia, of the Radical Civic Union of the People, had governed since October 1963 under a cloud, elected with a low share of the vote in a contest from which Peronists were banned, and his gradualist economic approach and tolerance of labor agitation drew hostility from the armed forces and business interests. Unlike Argentina's earlier coups, which had presented themselves as provisional governments pending a return to elections, the June 1966 movement declared itself a permanent new order, later theorized as the bureaucratic authoritarian state, and issued a statute placed above the constitution.
Ongania, a former army commander in chief, was sworn in and drew his cabinet heavily from private business. Within weeks he ended university autonomy in the July Night of the Long Truncheons, when police beat and arrested students and professors, driving hundreds of academics into exile. The United States recognized the government by mid-July.
Researched Details
Researched
Independent research, added record by record. Hover any label for what it means.
Target identified in Coup Atlas research: President Arturo Illia, deposed on June 28, 1966 and not physically harmed; he retired from public life after the coup.
RESEARCHED NAME
Key figures
Arturo Illia (deposed constitutional president)
Juan Carlos Ongania (general sworn in as de facto president)
Augusto Vandor (CGT labor leader who backed the coup)
Sources
The Argentine Revolution was the civil-military dictatorship that overthrew constitutional president Arturo Illia through a coup on June 28, 1966 and ruled until May 25, 1973; unlike previous Argentine coups it did not present itself as a provisional government but sought to establish a permanent dictatorial system, establishing General Juan Carlos Ongania as de facto president.
On June 28, 1966 a military uprising led by General Juan Carlos Ongania overthrew President Arturo Illia of the Radical Civic Union of the People, giving rise to a dictatorship calling itself the Argentine Revolution which did not claim to be a provisional government but established itself as permanent, issuing a 1966 statute that held a superior judicial position to the constitution.
SOURCE REVIEWEDWikipedia, Military coups in Argentinaopen source ↗
Ongania ended university autonomy and was responsible for the July 1966 Night of the Long Truncheons, ordering police to invade the Faculty of Sciences of the University of Buenos Aires, beating and arresting students and professors, with the repression leading to the exile of 301 university professors.
A US State Department record notes that the Argentine military overthrew the Illia Government on June 28, that General Juan Carlos Ongania, former commander in chief of the Argentine Army, was subsequently sworn in as President, that Chile recognized the Ongania government on July 8, and that the United States authorized delivery of its note of recognition in mid-July 1966.
SOURCE REVIEWEDForeign Relations of the United States, 1964-1968, Volume XXXI, Document 141open source ↗
Editorial Note
Coding note: the deposed president Illia was not physically harmed, matching the dataset fate; he was removed and retired. Significance flagged by sources: the June 1966 coup broke with the Argentine pattern of self-styled provisional governments by declaring itself permanent, the model later theorized as the bureaucratic authoritarian state, and its statute was placed above the constitution. Arc note: the Argentine Revolution produced two further internal coups (Levingston 1970, Lanusse 1971) before the 1973 return to elected government, and set precedents echoed in the harsher 1976 coup, all separate dataset events.
Cross-Reference
Datasets agree. At least two of the three reference datasets we check against carry this event, and none of them disagrees about its date or its result.
Identifiers for finding this same event in the other datasets:
Coup Atlas research identifies the target as: President Arturo Illia, deposed on June 28, 1966 and not physically harmed; he retired from public life after the coup..
Baseline coding: Incumbent executive removed from power. Recorded leader fate: deposed; 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
“Argentine Junta Ousts President, Puts General In,” by H.J. Maiden Berg, June 29, 1966
“President Takes Office,” by H. J. Maiden Berg, June 30, 1966
“Argentine Chief is Forced to Quit in Military Coup,” June 9, 1970
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 →