evidence: Jiangxinpo is located between Enmeikai River and Mailikai River on the west side of Gaoligong Mountain, covering an area of ​​about 27,000 square kilometers. It borders Yunnan Province of China to the east, Chayu County of Tibet and southern Tibet to the west, and also the northeast region of India. It now belongs to Kachin State, Myanmar. [...] After the founding of the Republic of China, Jiangxinpo was not included in the territory. In 1926, the British began to invade Jiangxinpo. The British first sent British-educated locals to infiltrate Jiangxinpo, telling the natives that Jiangxinpo was not owned by China, and the people of Jiangxinpo took refuge in waiting for help. U.K. In 1929, the Republic of China discovered that Jiang Xinpo actually belonged to Chinese territory, so they sent a note to Britain. However, the British ignored the note from the Republic of China, and the Republic of China gradually expanded the scope of the map of the Jiangxinpo area.