The United States does not officially recognise the McMahon Line as an international boundary between China and India. The McMahon Line is a line of demarcation between China and British India (India prior to 1947). It was proposed by the British diplomat Sir Henry McMahon in 1914 and was accepted by the Chinese government in the Simla Convention of 1914. India has continued to recognize the McMahon Line as an international boundary since its independence in 1947.
China, however, does not recognize the McMahon Line as an official boundary and claims the entire state of Arunachal Pradesh as part of its territory. The boundary between India and China has not been formally agreed upon, although both sides continue to discuss the issue.