The border between Tibet and India was negotiated privately in Simla between representatives of Great Britain and Tibet, in the absence of the Chinese representative. At the Simla conference, a map of the Tibet-India border was made available as an appendix to the proposed agreement.   [a] [c] The McMahon Line gained prominence when the Indian and Tibet signed an agreement at Shimla on July 3, 1914. Made in Simla on July 3, 1914, which corresponds to the Tibetan date, the 10th day of the 5th month of the Year of The Wood. Simla was initially rejected by the Indian government as incompatible with the 1907 Anglo-Russian Convention. The official protocol of the treaty, C.U. Aitchison A Collection of Treatys, was published with a note stating that no binding agreement had been reached in Simla.  As the condition set out in the agreement (agreement with China) was not met, the Tibetan government did not accept the McMahon line.  The two maps (April 27, 1914 and July 3, 1914), which illustrate the borders, bear the complete manuscript of the Tibetan agent; the first also bears the full manuscript of the Chinese agent; the second bears the full signature with the seals of the Tibetan and British agents.
(see Photographic reproductions of the two maps in the Atlas of India`s northern border, New Delhi: Ministry of Foreign Affairs 1960) On June 25, 1914, the British government, in a new attempt to convince the Chinese government to accept the Simla Convention, told the Chinese government that, according to China, Tibet was still part of its territory, so that the representative of Tibet is not allowed to accept an agreement without China`s agreement. In 1950, China occupied Tibet entirely. Today, China does not approve and accept the McMahon line and does not accept it. The Treaty of Shimla was signed in 1914 between the representatives of India and Tibet for a clear delimitation. China was not present in this agreement because Tibet was an independent region until then, which is why, at the time of this treaty, there was no demand for Chinese representation. His Majesty the King of the United Kingdom of Great Britain and Ireland and the British Lords Beyond the Seas, Emperor of India, His Excellency the President of the Republic of China, and His Holiness the Dalai Lama of Tibet, in the sincere desire to settle by mutual agreement various questions on the interests of their various states on the continent of Asia, and to further regulate the relations of their various governments. , have decided to reach an agreement on this subject and have appointed their respective representatives to that end, i.e. how could Zhou say that the negotiations were held behind the back of the Chinese representative? Some scholars have much to do to ensure that the Simla Convention is not signed, but only by the Chinese delegate; this indicates that it was not a legal document.