Pascual Ortiz Rubio served as President of Mexico from 1930 to 1932. He was one of three presidents to serve out the six-year term (1928–1934) of assassinated president-elect Álvaro Obregón, while former president Plutarco Elías Calles retained power in a period known as the Maximato. Calles was so blatantly in control of the government that Ortiz Rubio resigned the presidency in protest in September 1932.

Plutarco Elías Calles was a Mexican soldier and politician who served as President of Mexico from 1924 to 1928. After the assassination of Álvaro Obregón, Elías Calles founded the Institutional Revolutionary Party and held unofficial power as Mexico's de facto leader from 1929 to 1934, a period known as the Maximato. Previously, he served as a general in the Constitutional Army, as Governor of Sonora, Secretary of War, and Secretary of the Interior. During the Maximato, he served as Secretariat of Public Education, Secretary of War again, and Secretary of the Economy. During his presidency, he implemented many left-wing populist and secularist reforms, opposition to which sparked the Cristero War.