Hari Singh in the context of "Instrument of Accession (Jammu and Kashmir)"

Jammu and Kashmir, also known as Kashmir and Jammu, was a princely state in a subsidiary alliance with the British East India Company from 1846 to 1858, and under the paramountcy (or tutelage) of the British Crown from 1858 until British withdrawal and the partition of British India in 1947. Following the subsequent First Kashmir War between India and Pakistan, it became a disputed territory, now administered by three countries: China, India, and Pakistan. The princely state was created after the First Anglo-Sikh War, when the East India Company, which had annexed the Kashmir Valley, from the Sikhs as war indemnity, then sold it to the Raja of Jammu, Gulab Singh, for 75 lakh rupees.

At the time of the partition of India and the political integration of India, Hari Singh, the ruler of the state, delayed making a decision about the future of his state. However, an uprising in the western districts by the Gilgit Scouts against Hari Singh supported by informal militias from the neighbouring Northwest Frontier Province, and the Pakistani army personnel, forced his hand. On 26 October 1947, Hari Singh acceded to India in return for the Indian military being airlifted to Kashmir to counter the invasion by tribal militias from Pakistan, which were assisted by the Pakistani government and military leadership. The western and northern districts now known as Azad Kashmir and Gilgit-Baltistan passed to the control of Pakistan with the support of Gilgit Scouts, while the remaining territory stayed under Indian control, later becoming the Indian administered state of Jammu and Kashmir. India and Pakistan defined a cease-fire line dividing the administration of the territory with the intercession of the United Nations which was supposed to be temporary but still persists.

The Indo-Pakistani war of 1947–1948, also known as the first Kashmir war, was a war fought between India and Pakistan over the princely state of Jammu and Kashmir from 1947 to 1948. It was the first of four Indo-Pakistani wars between the two newly independent nations. Pakistan precipitated the war a few weeks after its independence by launching tribal lashkar (militias) from Waziristan, in an effort to capture Kashmir and to preempt the possibility of its ruler joining India.

Hari Singh, the Maharaja of Jammu and Kashmir, was facing an uprising by his Muslim subjects in Poonch, and lost control in portions of the western districts. On 22 October 1947, Pakistan's Pashtun tribal militias crossed the border of the state. These local tribal militias and irregular Pakistani forces moved to take the capital city of Srinagar, but upon reaching Baramulla, they took to plunder and stalled. Maharaja Hari Singh made a plea to India for assistance, and help was offered, but it was subject to his signing of an Instrument of Accession to India.

In spring 1947, an uprising against the Maharaja Hari Singh of Jammu and Kashmir broke out in the Poonch jagir, an area bordering the Rawalpindi district of West Punjab and the Hazara district of the North-West Frontier Province in the future Pakistan. It was driven by grievances such as high taxes, the Maharaja's neglect of World War veterans, and above all, Muslim nationalism with a desire to join Pakistan. The leader of the rebellion, Sardar Ibrahim Khan, escaped to Lahore by the end of August 1947 and persuaded the Pakistani authorities to back the rebellion. In addition to the backing, Prime Minister Liaquat Ali Khan authorised an invasion of the state, by the ex-Indian National Army personnel in the south and a force led by Major Khurshid Anwar in the north. These invasions eventually led to the First Kashmir War fought between India and Pakistan, and the formation of Azad Kashmir provisional government. The Poonch jagir has since been divided across Azad Kashmir, administered by Pakistan and the state of Jammu and Kashmir, administered by India.

Baltistan (English: /ˌbɔːltɪˈstɑːn/, Urdu: [bəlt̪ɪst̪aːn]); also known as Baltiyul or Little Tibet, is a mountainous region in the Pakistani-administered territory of Gilgit-Baltistan and constitutes a northern portion of the larger Kashmir region that has been the subject of a dispute between India and Pakistan since 1947. It is located near the Karakoram (south of K2) and borders Gilgit to the west, China's Xinjiang to the north, Indian-administered Ladakh to the southeast, and the Indian-administered Kashmir Valley to the southwest. The average altitude of the region is over 3,350 metres (10,990 ft). Baltistan is largely administered under the Baltistan Division.

Prior to the partition of British India in 1947, Baltistan was part of the princely state of Jammu and Kashmir, having been conquered by Gulab Singh's armies in 1840. Baltistan and Ladakh were administered jointly under one wazarat (district) of the state. The region retained its identity in this setup as the Skardu tehsil, with Kargil and Leh being the other two tehsils of the district. After Hari Singh, the last maharaja of Jammu and Kashmir, acceded to the Dominion of India in 1947, his local governor in Gilgit was overthrown by the Gilgit Scouts, who then took the entire region for Pakistan during the Indo-Pakistani War of 1947–1948. The Gilgit Agency and Skardu tehsil, as well as a portion of Kargil tehsil, have since been under Pakistani governance while the Kashmir Valley as well as Leh tehsil and most of the Kargil tehsil remain under Indian governance. The Chorbat Valley, geographically in the Baltistan region, was de-facto partitioned when its four villages (with one Bogdang already under Indian control since 1947) were captured by India during the Indo-Pakistani War of 1971, and were incorporated into the erstwhile state of Jammu and Kashmir (now in Ladakh).

The Dogra dynasty of Dogra Rajputs from the Shivalik hills created Jammu and Kashmir through the treaties with the East India Company following the First Anglo-Sikh war. Events led the Sikh Empire to recognise Jammu as a vassal state in 1820, and later the British added Kashmir to Jammu with the Treaty of Amritsar in 1846. The founder of the dynasty, Gulab Singh, was an influential noble in the court of the Sikh emperor Maharaja Ranjit Singh, while his brother Dhian Singh served as the prime minister of the Sikh Empire. Appointed by Ranjit Singh as the hereditary Raja of the Jammu principality, Gulab Singh established his supremacy over all the hill states surrounding the Kashmir Valley. After the First Anglo-Sikh War in 1846, under the terms of the Treaty of Lahore, 1846, the British East India Company acquired Kashmir from the Sikh Empire and transferred it to Gulab Singh, recognising him as an independent Maharaja. Thus, Jammu and Kashmir was established as one of the largest princely states in India, receiving a 21-gun salute for its Maharaja in 1921. It was ruled by Gulab Singh and his descendants until 1947.

The last ruling Maharaja of Jammu and Kashmir was Hari Singh, who contributed troops to the British war effort in World War II and served on Churchill's Imperial War Cabinet. Following the Partition of India in 1947, Hari Singh faced a rebellion in the western districts of the state and a Pakistan-supported tribal invasion, leading him to accede to the Union of India and receive military assistance. Pakistan contested the accession, giving rise to the enduring Kashmir conflict.