After the occupation of Nepal by the Gorkhas in 1769 , during the Gorkha - Tibetan war in 1792 the Qianlong Emperor of the Qing dynasty drove the Gorkhas from Tibet .
The Tibetans were isolated from their neighbors .
After the occupation of Nepal by the Gorkhas in 1769 , during the Gorkha - Tibetan war in 1792 the Qianlong Emperor of the Qing dynasty drove the Gorkhas from Tibet and the Tibetans were isolated from their neighbors .