At an elevation of 5,000 m, the desolation of Aksai Chin had no human importance other than an ancient trade route that crossed over it, providing a brief pass during summer for caravans of yaks between Xinjiang and Tibet.[5]
One of the earliest treaties regarding the boundaries in the western sector was issued in 1842. The Sikh Confederacy of the Punjab region in India had annexed Ladakh into the state of Jammu in 1834. In 1841, they invaded Tibet with an army. Chinese forces defeated the Sikh army and in turn entered Ladakh and besieged Leh. After being checked by the Sikh forces, the Chinese and the Sikhs signed a treaty in September 1842, which stipulated no transgressions or interference in the other country's frontiers.[6] The British defeat of the Sikhs in 1846 resulted in transfer of sovereignty over Ladakh to the British, and British commissioners attempted to meet with Chinese officials to discuss the border they now shared. However, both sides were apparently sufficiently satisfied that a traditional border was recognized and defined by natural elements, and the border was not demarcated.[6] The boundaries beyond the extremities of Aksai Chin near Pangong Lake and near the Karakoram Pass were well-defined, but the Aksai Chin area in between lay undefined.[5][7]
The Johnson Line
Map of Central Asia (1878) showing Khotan (near top right corner). The previous border claimed by the British Indian Empire is shown in the two-toned purple and pink band with Shahidulla and the Kilik, Kilian and Sanju Passes clearly north of the border.
The map shows the Indian and Chinese claims of the border in the Aksai Chin region, the Macartney-MacDonald line, the Foreign Office Line, as well as the progress of Chinese forces as they occupied areas during the Sino-Indian War.
W. H. Johnson, a civil servant with the Survey of India proposed the "Johnson Line" in 1865, which put Aksai Chin in Kashmir.[8] This was the time of the Dungan revolt, when China did not control Xinjiang, so this line was never presented to the Chinese.[8] Johnson presented this line to the Maharaja of Kashmir, who then claimed the 18,000 square kilometres contained within,[8] and by some accounts territory further north as far as the Sanju Pass in the Kun Lun Mountains. Johnson's work was severely criticized for gross inaccuracies, with description of his boundary as "patently absurd".[9] Johnson was reprimanded by the British Government and resigned from the Survey.[8][9][10] The Maharajah of Kashmir apparently sent a few soldiers to man the abandoned fort at Shahidulla (modern-day Xaidulla) at one point, by the time most sources placed Shahidulla and the upper Karakash River firmly within the territory of Xinjiang (see accompanying map). According to Francis Younghusband, who explored the region in the late 1880s, there was only an abandoned fort and not one inhabited house at Shahidulla when he was there - it was just a convenient staging post and a convenient headquarters for the nomadic Kirghiz.[11] The abandoned fort had apparently been built a few years earlier by the Kashmiris.[12] In 1878 the Chinese had reconquered Xinjiang, and by 1890 they already had Shahidulla before the issue was decided.[8] By 1892, China had erected boundary markers at Karakoram Pass.[9]
In 1897 a British military officer, Sir John Ardagh, proposed a boundary line along the crest of the Kun Lun Mountains north of the Yarkand River.[13] At the time Britain was concerned at the danger of Russian expansion as China weakened, and Ardagh argued that his line was more defensible. The Ardagh line was effectively a modification of the Johnson line, and became known as the "Johnson-Ardagh Line".
The Macartney–Macdonald Line
The map given by Hung Ta-chen to the British consul at Kashgar in 1893. The boundary matches the Macartney-MacDonald line.
In 1893, Hung Ta-chen, a senior Chinese official at Kashgar, handed a map of the boundary proposed by China to George Macartney, the British consul-general at Kashgar.[14] This boundary placed the Lingzi Tang plains, which are south of the Laktsang range, in India, and Aksai Chin proper, which is north of the Laktsang range, in China. Macartney agreed with the proposal and forwarded it to the British Indian government. This border, along the Karakoram Mountains, was proposed and supported by British officials for a number of reasons. The Karakoram Mountains formed a natural boundary, which would set the British borders up to the Indus River watershed while leaving the Tarim River watershed in Chinese control, and Chinese control of this tract would present a further obstacle to Russian advance in Central Asia.[10] The British presented this line, known as the Macartney–MacDonald Line, to the Chinese in 1899 in a note by Sir Claude MacDonald. The Qing government did not respond to the note, and the British took that as Chinese acquiescence.[8] Although no official boundary had ever been negotiated, China believed that this had been the accepted boundary.[2][15]
1899 to 1947
Both the Johnson-Ardagh and the Macartney-MacDonald lines were used on British maps of India.[8] Until at least 1908, the British took the Macdonald line to be the boundary,[16] but in 1911, the Xinhai Revolution resulted in the collapse of central power in China, and by the end of World War I, the British officially used the Johnson Line. However they took no steps to establish outposts or assert actual control on the ground.[9] In 1927, the line was adjusted again as the government of British India abandoned the Johnson line in favor of a line along the Karakoram range further south.[9] However, the maps were not updated and still showed the Johnson Line.[9]
Postal Map of China published by the Government of China in 1917. The boundary in Aksai Chin is as per the Johnson line.
From 1917 to 1933, the "Postal Atlas of China", published by the Government of China in Peking had shown the boundary in Aksai Chin as per the Johnson line, which runs along the Kunlun mountains.[14][15] The "Peking University Atlas", published in 1925, also put the Aksai Chin in India.[17] When British officials learned of Soviet officials surveying the Aksai Chin for Sheng Shicai, warlord of Xinjiang in 1940-1941, they again advocated the Johnson Line.[8] At this point the British had still made no attempts to establish outposts or control over the Aksai Chin, nor was the issue ever discussed with the governments of China or Tibet, and the boundary remained undemarcated at India's independence.[8][9]
Since 1947
Upon independence in 1947, the government of India used the Johnson Line as the basis for its official boundary in the west, which included the Aksai Chin.[9] From the Karakoram Pass (which is not under dispute), the Indian claim line extends northeast of the Karakoram Mountains through the salt flats of the Aksai Chin, to set a boundary at the Kunlun Mountains, and incorporating part of the Karakash River and Yarkand River watersheds. From there, it runs east along the Kunlun Mountains, before turning southwest through the Aksai Chin salt flats, through the Karakoram Mountains, and then to Panggong Lake.[5]
On July 1, 1954 Prime Minister Jawaharlal Nehru wrote a memo directing that the maps of India be revised to show definite boundaries on all frontiers. Up to this point, the boundary in the Aksai Chin sector, based on the Johnson Line, had been described as "undemarcated."[10]
During the 1950s, the People's Republic of China built a 1,200 km (750 mi) road connecting Xinjiang and western Tibet, of which 179 km (112 mi) ran south of the Johnson Line through the Aksai Chin region claimed by India.[5][8][9] Aksai Chin was easily accessible to the Chinese, but was more difficult for the Indians on the other side of the Karakorams to reach.[5] The Indians did not learn of the existence of the road until 1957, which was confirmed when the road was shown in Chinese maps published in 1958.[18]
The Indian position, as stated by Prime Minister Nehru, was that the Aksai Chin was "part of the Ladakh region of India for centuries" and that this northern border was a "firm and definite one which was not open to discussion with anybody".[5]
The Chinese minister Zhou Enlai argued that the western border had never been delimited, that the Macartney-MacDonald Line, which left the Aksai Chin within Chinese borders was the only line ever proposed to a Chinese government, and that the Aksai Chin was already under Chinese jurisdiction, and that negotiations should take into account the status quo.[5]
Trans Karakoram Tract
Main article: Trans Karakoram Tract
The Johnson Line is not used west of the Karakoram Pass, where China adjoins Pakistan-administered Gilgit–Baltistan. On October 13, 1962, China and Pakistan began negotiations over the boundary west of the Karakoram Pass. In 1963, the two countries settled their boundaries largely on the basis of the Macartney-MacDonald Line, which left the Trans Karakoram Tract in China, although the agreement provided for renegotiation in the event of a settlement of the Kashmir dispute. India does not recognise that Pakistan and China have a common border, and claims the tract as part of the domains of the pre-1947 state of Kashmir and Jammu. However, India's claim line in that area does not extend as far north of the Karakoram Mountains as the Johnson Line[5]