In 1924, Plutarco Elías Calles took office as President of Mexico, and Calles sought to limit American property claims and take control of the holdings of the Catholic Church. However, Ambassador Dwight Morrow convinced Calles to allow Americans to retain their rights to property purchased before 1917, and Mexico and the United States enjoyed good relations for the remainder of Coolidge's presidency. With the aid of a Catholic priest from the U.S., Morrow also helped bring an end to the Cristero War, a Catholic revolt against Calles's government.