Since the People's Republic of China gained control of Tibet in 1951, there has been institutional racism in the form of an elaborate propaganda system designed by the Communist Party of China to portray Tibetans as being liberated through China and Han Chinese culture. A state-organized historical opera performed in 2016 in China portrayed Tibet as being unsophisticated prior to Princess Wencheng's marriage to Songtsen Gampo, a Tibetan emperor, in the year 641. This propaganda is described by Tibetan activist Woeser as being a "...vast project that rewrites history and ‘wipes out’ the memory and culture of an entire people."