[1] The Social Democratic Party was founded in 1944 by younger, conservative Bolivians committed to modernization and the technological and technocratic strategies they believed necessary to achieve it.
[4] For the 1951 general elections, the PSD allied with the Republican Socialist Unity Party and backed PURS' presidential candidate Gabriel Gosálvez Tejada [Wikidata].
[5] During the Revolutionary Nationalist Movement regime (1952–1964), the Social Democratic Party was a minor force, allied electorally with the Bolivian Socialist Falange.
[6] After Víctor Paz Estenssoro's overthrow in 1964, the Social Democratic Party obtained a new lease on life and cooperated with the military regime of General René Barrientos Ortuño.
[9] In succeeding years, the Social Democratic Party became inactive after that, although Luis Adolfo Siles Salinas continued to pursue his presidential ambitions.