In Argentina, there were six coups d'état during the 20th century: in 1930, 1943, 1955, 1962, 1966 and 1976. The first four established interim dictatorships, while the last two established dictatorships of permanent type on the model of a bureaucratic-authoritarian state. The latter conducted a Dirty War in the line of State terrorism, in which human rights were systematically violated and there were tens of thousands of forced disappearances.
In the 53 years since the first military coup in 1930, until the last dictatorship fell in 1983, the military ruled the country for 25 years, imposing 14 dictators under the title of "president", one every 1.7 years on average. In that period, the democratically elected governments (radicals, peronists and radical-developmentalists) were interrupted by coups.
The military coup of September 6, 1930 was led by General José Félix Uriburu and overthrew president Hipólito Yrigoyen of the Radical Civic Union, who had been democratically elected to exercise his second term in 1928. In an unprecedented move, Uriburu also dissolved Parliament. Paradoxically, General Uriburu had been one of the organizers of the Revolution of the Park, a civic-military uprising that give rise to the Radical Civic Union.