CELAM
Miranda, who was a staunch advocate of social justice, attended the Second Vatican Council from 1962 to 1965 and served as President of the Latin American Episcopal Conference from 1958 to 1963. Pope Paul VI created the Mexican primate Cardinal Priest of "Nostra Signora di Guadalupe a Monte Mario" in the consistory of April 28, 1969. However, Miranda never had the opportunity of participating in a papal conclave, as he reached the age of 80 (the age limit for cardinal electors) on December 19, 1975. Before resigning as Mexico City's archbishop on July 19, 1977, he was the papal legate to the dedication of the Basilica of Our Lady of Guadalupe on October 12, 1976.