Ladakh was a tributary country of China before British occupation. It had been like this since 7th century in order to protect them from central Asia nomads and receive other helps.
Meanwhile there was no India as a country, and the India subcontinent was made of many kingdoms. Also it seems that "India" did not give anything good to Ladakh.
Genetically, people of Ladakh are close to Chinese. And their language belongs to sino-tibetan language family.
India should not take everything from British as granted. We never agreed the boundary. China has more rights to claim that area whether you like or not. Definitely, Ladakh can form an independent country like before.
Here is some facts which will counter claim your claim of 7th century:
The first glimpse of political history is found in the kharosthi inscription of "Uvima Kavthisa" discovered near the K'a-la-rtse (Khalatse) bridge on the Indus,
showing that in around the 1st century, Ladakh was a part of the Kushan empire. A few other short Brahmi and Kharosthi inscriptions have been found in Ladakh.
Kushan Empire - Wikipedia, the free encyclopedia
And also it was the same Kushan empire that brought Buddhism to China.
The
Chinese-pilgrim monk, Xuanzang, c. 634 CE, describes a journey from Chuluduo (Kūluta, Kulu) to Luohuluo (Lahul) and then states that, "[f]rom here, the road, leading to the north, for over one thousand, eight hundred or nine hundred li by perilous paths and over mountains and valleys, takes one to the country of Lāhul. Going further to the north over two thousand li along a route full of difficulties and obstacles, in cold winds and wafting snowflakes, one could reach the country of Marsa (also known as Sanbohe)."[3] The kingdom of Moluosuo, or Mar-sa, would seem to be synonymous with Mar-yul, a common name for Ladakh. Elsewhere, the text remarks that Mo-lo-so, also called San-po-ho borders with Suvarnagotra or
Suvarnabhumi (Land of Gold), identical with the Kingdom of Women (Strirajya).
Suvarnabhumi is sanskrit and also has the same meaning in Hindi i.e. The Land Of Gold.
It was only later in 7th century ladhak came under rule of Tibet.
Source:
In 634/5 Zhangzhung acknowledged Tibetan suzernaity for the first time, and in 653 a Tibetan commissioner (mnan) was appointed there. Regular administration was introduced in 662, and an unsuccessful rebellion broke out in 677.
Hyecho (704-787) (pinyin: Hui Chao), reached India by sea and returned to China in 727 via central Asia.[4] He referred to three kingdoms lying to the northeast of Kashmir which were:
"under the suzerainty of the Tibetans. . . . The country is narrow and small, and the mountains and valleys very rugged. There are monasteries and monks, and the people faithfully venerate the Three Jewels. As to the kingdom of Tibet to the East, there are no monasteries at all, and the Buddha's teaching is unknown; but, in [these] countries, the population consists of Hu; therefore, they are believers. (Petech, The Kingdom of Ladakh, p. 10)."[2]
Rizvi points out that this passage not only confirms that, in the early 8th century, the region of modern Ladakh was under Tibetan suzerainty, but that the people belonged to non-Tibetan stock.
Which means the people of Ladhak were not Buddhists at that time and Ladhak was conquered by Tibet.
After the collapse of the Tibetan monarchy in 842, Tibetan suzerainty quickly vanished.
In the 18th Century
Deldan Namgyal (1642–1694) had to placate the Mughal emperor Aurangzeb by building a mosque in Leh. However, he later with the help of the Mughal Army under Fidai Khan, son of Mughal viceroy of Kashmir, Ibrahim Khan,
defeated the 5th Dalai Lama in the plains of Chargyal, situated between Neemoo and Basgo
By the beginning of the 19th century, the Mughal empire had collapsed, and Sikh rule had been established in Punjab and Kashmir. However the Dogra region of Jammu remained under its Rajput rulers, the greatest of whom was Maharaja Gulab Singh whose
General Zorawar Singh invaded Ladakh in 1834. King Tshespal Namgyal was dethroned and exiled to Stok. Ladakh came under Dogra rule and was incorporated into the state of Jammu and Kashmir in 1846. It still maintained considerable autonomy and relations with Tibet.
During the Sino-Sikh war (1841-1842), the Qing Empire invaded Ladakh but the Sino-Tibetan army was defeated.
In 1947, partition left Ladakh a part of the Indian state of Jammu and Kashmir, to be administered from Srinagar. In 1948, Pakistani raiders invaded Ladakh and occupied Kargil and Zanskar, reaching within 30 km of Leh.[8] Reinforcement troops were sent in by air, and a battalion of Gurkhas made its way slowly to Leh on foot from south. Kargil was a scene of fighting again in 1965, 1971, and 1999.
In 1949, China closed the border between Nubra and Sinkiang, blocking the 1000-year old trade route from India to Central Asia. In 1950, China invaded Tibet, and thousands of Tibetans, including the Dalai Lama sought refuge in India. In 1962, China occupied Aksai Chin, and promptly built roads connecting Sinkiang and Tibet, and the Karakoram Highway, jointly with Pakistan. India built the Srinagar-Leh highway during this period, cutting the journey time between Srinagar to Leh from 16 days to two. Simultaneously, China closed the Ladakh-Tibet border, ending the 700-year old Ladakh-Tibet relationship.