Was Sikkim once the territory of China in history? Who can tell us more about the history of Sikkim?

Sikkim was originally a kingdom of Sikkim (now Sikkim, India). 1975, Sikkim was annexed into a state by India, and the China government officially recognized Sikkim as an autonomous state of India in 2005. Article 13 of the Joint Statement between People's Republic of China (PRC) and India signed on April 2 1 2005 reads: "The two sides reviewed with satisfaction the implementation of the Memorandum on Border Trade between Xizang Autonomous Region, People's Republic of China (PRC) and Sikkim, India, through the Nathula Pass."

Sikkim in history was once the territory of China, and it belonged to Tibet from the 7th century to 1890 1200 years ago. Sikkim is now occupied by India. In China's ancient books, ancient Sikkim was named Dremojong. Nepalese people moved here and called it a "new place", while early Tibetan immigrants called it a trip to Xinjiang, which means rice. As early as the 7th century, Zhe Mengxiong was a part of Tibet. In the 9th century, Zhemengxiong became an independent tribe, but the monasteries in its territory still belonged to the major monasteries in Tibet. There are many myths circulating in Sikkim, but there are not many historical records before the establishment of hereditary monarchy. Sikkim used to be the residence of Leibucha people, most of whom lived on the southern slope of the Himalayas. Sikkim is a country full of myths and legends, and there are few ancient historical materials handed down. The first recorded king was Ponzug Namgyal, and his great-grandfather was Guru Tahi, a noble in Tibet. Pang Chuge ascended the Sikkim throne on 1642. Under his rule, Leibucha people lived in harmony with Sikkim people and engaged in animal husbandry and planting. Pang Chuge declared Buddhism as the state religion and implemented the feudal system of the integration of politics and religion. He established his capital in gangtok, and divided the whole country into a number of Shagu (equivalent to counties) for governance. The third king Chador Namgyal (reigned from1700 to 17 17) built the temple of Pema Yang Ze (present-day templo mayor) and invented letters for the Rebucha people.