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Emilio Cándido Portes Gil (3 October 1890 – 10 December 1978) was President of Mexico from 1928 to 1930, one of three to serve out the six-year term of President-elect General Álvaro Obregón, who had been assassinated in 1928. Since the Mexican Constitution of 1917 forbade re-election of a serving president, incumbent President Plutarco Elías Calles could not formally retain the presidency. Wikipedia