In the aftermath of the revolt, Chinese authorities imposed radical social reforms and further restrictions to religious freedom. The Great Leap Forward and Cultural Revolution further intensified Tibetan resentment against Chinese rule and strengthened group identification. By 1980, Deng Xiaoping's ascension to leadership and the implementation of the Chinese economic reform program led to reform of earlier repressive policies against ethnic minorities, and granted nominal political autonomy to Tibet. While the Chinese government has invested considerably in the development of the Tibetan economy, education system and infrastructure, the continuing restrictions to religious expression and political participation resulted in resentment amongst the Tibetan populace, leading to the 1987–1989 Tibetan unrest. The unrest prompted Chinese authorities to focus more on the economic, educational, and infrastructural development of the region, intensify efforts to undermine the religious and political influence of the Dalai Lama, and encourage ethnic Han migration to the region.