In 1954, India published new maps that included the Aksai Chin region within the boundaries of India (maps published at the time of India's independence did not clearly indicate whether the region was in India or Tibet).
When India discovered that China built a road through the region, border clashes and Indian protests became more frequent and serious. In January 1959, PRC premier Zhou Enlai wrote to Nehru, rejecting Nehru's contention that the border was based on treaty and custom and pointing out that no government in China had accepted as legal the McMahon Line, which in the 1914 Simla Convention defined the eastern section of the border between India and Tibet.
The Dalai Lama, spiritual and temporal head of the Tibetan people, sought sanctuary in Dharmsala, Himachal Pradesh, in March 1959, and thousands of Tibetan refugees settled in northwestern India, particularly in Himachal Pradesh. The People's Republic of China accused India of expansionism and imperialism in Tibet and throughout the Himalayan region. China claimed 104,000 km² of territory over which India's maps showed clear sovereignty, and demanded "rectification" of the entire border.