The McMahon Line is a boundary demarcation line that was drawn in 1914 to mark the border between British India and Tibet. It was named after Henry McMahon, the British Indian government's foreign secretary at the time.
The McMahon Line was drawn as part of the Simla Accord, a treaty signed between the British Indian government and the Tibetan government in 1914. The accord was intended to settle a long-standing dispute over the border between the two regions, which had been a source of tension for many years.
The McMahon Line was not recognized by the Tibetan government, and the Chinese government later claimed that it had never been formally notified of the accord. As a result, the McMahon Line has been a source of controversy and tension between India and China, with both countries laying claim to territory on either side of the line.
The McMahon Line has played a significant role in the history of the region, and it continues to be an important issue in the ongoing border disputes between India and China.