They bought the land or went to war for it. The US citizens thought it was their destiny to own North American from ocean to ocean. This is called the manifest destiny.
The Kirati people, also spelled as Kirant or Kiranti, are a Sino-Tibetan ethnic group. They believe they are indigenous aboriginals of the Himalayas, mostly the Eastern Himalayan region of the Indian subcontinent, extending eastward from Nepal to North East India - predominantly in the Indian state of Sikkim and the northern hilly region of West Bengal, Darjeeling and Kalimpong districts.
Hope it works
Professional education educates the new generation of professionals, expanding the frontiers of knowledge and reaching out in service to society. Professional education is increasingly being called upon to play a significant role in the administration of new programs within continuing and new structures.