In 1910, the government of Bhutan signed a treaty with the British in India, granting them control over Bhutan's foreign relations. The actual immigrants registered and settled through the agent from Kalimpong, Raja Ugen Dorji and (son) Raja Sonam Togbay Dorji started in the reigns of the second and third kings. Immigrants from Nepal and India continued to enter Bhutan with an increase from the 1960s when Bhutan's first modern five-year plan began, many arriving as construction workers.
In 1910, the government of Bhutan signed a treaty with the British in India, granting them control over Bhutan's foreign relations. The actual immigrants registered and settled through the agent from Kalimpong, Raja Ugen Dorji and (son) Raja Sonam Togbay Dorji started in the reigns of the second and third kings. Immigrants from Nepal and India continued to enter Bhutan with an increase from the 1960s when Bhutan's first modern five-year plan began, many arriving as construction workers.