In 1913 Tibet declared independence from China.

Potala palace – Wikipedia

In October 1950 China invaded Tibet.

ZanderSchubert – Wikipedia

In May 1951, Tibet affirmed China’s sovereignty and established an autonomous administration led by Dalai Lama.

Wikimedia Commons

In 1959 the Dalai Lama fled to northern India and established the Central Tibetan Administration.

Emblem of Exiled Tibetan People’s Organisation – Wikimedia

The Tibet Autonomous Region within China was officially established in 1965.[1]

Source: History of Tibet (1950–present)