Mamerto Urriolagoitía

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Mamerto Urriolagoitia
50th President of Bolivia
In office
22 October 1949 – 16 May 1951
Preceded by Enrique Hertzog
Succeeded by Hugo Ballivián
Vice President of Bolivia
In office
10 March 1947 – 24 October 1949
President Enrique Hertzog
Preceded by Julián Montellano
Succeeded by Hernán Siles Zuazo
Personal details
Born Mamerto Urriolagoitia Harriague
5 December 1895
Sucre, Bolivia
Died 4 June 1974 (age 78)
Sucre, Bolivia
Nationality bolivian
Political party Republican Socialist Unity Party

Mamerto Urriolagoitia Harriague (December 5, 1895 – June 4, 1974) was President of Bolivia, from 1949 to 1951. Of privileged background, he studied in France and later joined the Bolivian diplomatic service. In 1947, Urriolagoitia was elected Vice-President to Dr. Enrique Hertzog[1] and endured the constant pressures for reform emanating from the poorest sectors of society. A hard-liner when it came to dealing with the opposition, he was preferred by the threatened conservatist elites (some would say the forces of reaction), who in 1949 forced President Hertzog to resign. Thus, Urriolagoitia became chief executive and immediately stepped up the repression of the reformist movement, quickly amalgamating behind the Movimiento Nacionalista Revolucionario (Nationalist Revolutionary Movement) of Víctor Paz Estenssoro, Juan Lechín, Hernán Siles Zuazo, and others. A counter-reaction took place and a series of violent nationwide rebellions catalyzed the so-called Civil War of May–September 1949. The Urriolagoitia government barely regained control of the situation, but the die was cast on the moribund "Oligarchic State" of 1880-1936, resuscitated only temporarily (1940–43 and 1946–52) by the economic and mining interests that upheld it.

In the 1951 presidential elections, time finally caught up with the system, and the opposition party, led by Víctor Paz Estenssoro, was declared the winner, despite the fact that under current law only the privileged, educated, and propertied could vote. That is how widespread the calls for fundamental change had become. Urriolagoitia, however, refused to even consider turning over his presidential sash to Paz. Instead, he did something almost unheard of in politics: he willingly installed as President the head of the Bolivian military, General Hugo Ballivián Rojas, thus unilaterally inflicting a coup against himself and the democratic order. This came to be known as the "Mamertazo" of 1951. With the elections annulled and Ballivián firmly installed in the Palacio Quemado, Urriolagoitia left the country. Retired from politics, he returned in later years and died in his native Sucre on June 4, 1974, at the age of 78.

Mamerto Urriolagoitia is best remembered for his inflexibility — and for being the last Constitutional President of the largely oligarchic social and political order that reigned in the country until the advent of the 1952 Revolution.


  • Mesa José de; Gisbert, Teresa; and Carlos D. Mesa, "Historia de Bolivia", 3rd edition., pp. 579–587.
Political offices
Preceded by
Vice President of Bolivia
Succeeded by
Preceded by
Enrique Hertzog
President of Bolivia
Succeeded by
Hugo Ballivián