Why is it easier for India to enter Tibet?

1. After the kingdom of Sikkim was annexed, a large number of immigrants from India changed the population structure of Sikkim, so Sikkim was extremely stable and never rebelled.

2. South Tibet It is a part of Tibet in China and the pearl of Tibet in China, with a total area of over 90,000 square kilometers, which is basically equivalent to the size of South Korea. Moreover, whether in history or in modern times, southern Tibet is an inseparable part of China. It is also a holy place in the eyes of the Tibetan people in China. However, since the 1960s, this holy place has been under the control of India. After India occupied southern Tibet, it continued to emigrate to southern Tibet.