Waves of mass migrations from Hong Kong villagers exercised their right of abode in the United Kingdom and left for Europe. In 1967, a series of large-scale riots erupted in Hong Kong, causing social instability. These events led some of the richer Hong Kong residents to move abroad. Emigration took place to countries in Southeast Asia, South Africa or South American countries. This wave did not come to a rest until the mid-1970s. On the 19th of December 1984, the People's Republic of China and the United Kingdom signed the "Sino-British Joint Declaration", validated the 1997 transfer of sovereignty over Hong Kong to China. The declaration prompted
Handover of Hong Kong of the PRC's view with regards to the question of Hong Kong; during their meeting, Deng outlined his plans to make the territory a special economic zone, which would retain its capitalist system under Chinese sovereignty. In the same year, Edward Youde, who succeeded MacLehose as the 26th Governor of Hong Kong, led a delegation of five Executive Councillors to London, including Chung Sze-yuen, Lydia Dunn, and Roger Lobo. Chung presented their position on the sovereignty of Hong Kong to Thatcher, encouraging her to take into consideration the interests of the native Hong Kong population in her upcoming visit to