In 1707 another Mongol people, the Dzungars invaded Tibet and killed Lhasang Kang. The Chinese were alarmed by the Dzungar success. In 1720 they sent a representative called an Amban to Tibet. They also stationed Chinese troops there. In time the Chinese began to see themselves as overlord of Tibet.
In the 18th century Tibet isolated itself from the rest of the world. However in the early 20th century Tibet suffered a British invasion. At that time the British ruled India. While the British did not seek to rule Tibet they feared that it would fall under Russian influence.
The Dalai Lama fled to Mongolia and the Chinese representative or Ambman declared that the Dalai Lama was deposed. The Tibetan people ignored him. The British then forced Tibet to sign a treaty allowing some trade with the British Empire and excluding 'foreign influence' (Russia) from Tibetan affairs.
The Chinese were alarmed by the British invasion of Tibet. They feared that if Tibet fell into British hands then China would fall under British influence. In 1909 the Chinese invaded Tibet. The Dalai Lama fled to India.
However in 1911 a revolution broke out in China and the emperor was overthrown. Chinese troops in Tibet were forced to withdraw. In 1912 the Dalai Lama returned. However in 1913 Chinese troops returned and occupied parts of Tibet.
In 1914 the British persuaded the Chinese to accept a treaty called the Simla Convention. The treaty divided Tibet into 2 regions, Inner Tibet and Outer Tibet. The Dalai Lama ruled Outer Tibet (although China claimed suzerainty or loose control). The Chinese were given partial control over Inner Tibet, although the treaty said Tibet would not be absorbed into China.
Neither side was satisfied with the treaty. In 1918 the Chinese invaded Tibet again but were forced to retreat.
In the 1920s and 1930s some attempts were made to modernize Tibet but it remained a traditional and very isolated country. It was also a feudal society. Most of the land was owned by monasteries or by rich families. Most of the people were serfs. In 1951 Tibet was annexed by China. However in 1959 resentment of Chinese rule led to a rebellion. The rebellion was quickly crushed and the Dalai Lama fled to India.
Under Chinese rule serfdom was abolished and in 1965 Tibet was made an autonomous region.
The Dalai Lama was awarded the Nobel Peace Prize in 1989.
In 2006 a railway was built from Beijing to Lhasa. It is the highest railway in the world. However in March 2008 rioting took place in Lhasa. Nevertheless at the present time the Tibetan economy is growing rapidly and the region is rich in minerals.