 The Bureau of Non-Christian Tribes was replaced by the Office of the Commissioner for Mindanao and Sulu, whose main objective was to tap the full economic potentials of Mindanao not for the Muslims but for the Commonwealth.These "development" efforts resulted in discontent which found expression in the various armed uprisings, mostly in Lanao, from 1936 to 1941.The Muslims are generally adverse to anything that threatens Islam and their way of life.