In 1946, the party founded by Plutarco Elías Calles in the wake of President-elect Álvaro Obregón's assassination in 1928 changed its name to the Institutional Revolutionary Party. With the party's presidential choice in 1946, Miguel Alemán Valdés, Mexico elected its first civilian president since Francisco I. Madero in 1911. The subsequent elections of Adolfo Ruiz Cortines (1952–58) and Adolfo López Mateos (1958–64), Gustavo Díaz Ordaz (1964–70) there were no political opposition challenges to the government's implementation of economic programs.