Much of Bhutan's modern development has been attributed by Bhutanese historians to the first Druk Gyalpo. Internal reforms included introducing Western-style schools, improving internal communications, encouraging trade and commerce with India, and revitalizing the Buddhist monastic system. Toward the end of his life, Ugyen Wangchuck was concerned about the continuity of the family dynasty, and in 1924 he sought British assurance that the Wangchuck family would retain its preeminent position in Bhutan. His request led to an investigation of the legal status of Bhutan vis-à-vis the suzerainty held over Bhutan by Britain and the ambiguity of Bhutan's relationship to India. Both the suzerainty and the ambiguity were maintained.