 US Ambassador Dwight W. Morrow brokered negotiations between the Calles government and the Church.The government made some concessions, the Church withdrew its support for the Cristero fighters, and the conflict ended in 1929.The rebellion has been variously interpreted as a major event in the struggle between church and state that dates back to the 19th century with the War of Reform, as the last major peasant uprising in Mexico after the end of the military phase of the Mexican Revolution in 1920, and as an counter-revolutionary uprising by prosperous peasants and urban elites against the revolution's agrarian reforms.