evidence: Jiangxinpo refers to the area between Enmeikai River and Mailikai River, west of Gaoligong Mountain, Yunnan, with an area of ​​about 27,000 square kilometers. It is the traditional residence of Jingpo and Nongriwang (Dulong in Jingpohua). Since the Ming Dynasty, China and Myanmar have often had wars over border territorial issues. The establishment of the Qing Dynasty also conquered Burma in the Shunzhi and Qianlong years, making it a Chinese vassal. The "Dynasty Unification Map" in the late Qing Dynasty did not mark Jiangxinpo as Chinese territory. In 1935, the "Overview of China's Latest Situation" used undetermined national boundaries to classify Jiangxinpo as Chinese territory. [...] From 1926 to 1927, the British invaded and occupied Jiangxinpo, which aroused great repercussions in China. The people were agitated and asked the national government to intervene. In 1929, the Yunnan Negotiation Office of the Chinese government submitted a note of protest to the British Consul General in Yunnan, saying that "the area around the central slope of the Zhajiang River is still Chinese territory, and the border affairs between Yunnan and Burma have not yet been determined."