Analysis of information sources in references of the Wikipedia article "Kachin State" in English language version.
In 1910 the British, then established in Burma, induced the tusi of Pianma (Hpimau) to defect from the central Chinese government, and they then occupied his territory in northwestern Yunnan. Britain also forced China to give up a tract of territory in what is now the Kachin state of Myanmar (1926–27), as well as the territory in the Wa states (1940).
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