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 territories were secured and conditions were ripe for its gradual abrogation. A few months after Thatcher's visit to Beijing, the PRC government had yet to open negotiations with the British government regarding the sovereignty of Hong Kong. Shortly before the initiation of sovereignty talks, Governor Youde declared his intention to represent the population of Hong Kong at the negotiations. This statement sparked a strong response from the PRC, prompting Deng Xiaoping to denounce talk of "the so-called 'three-legged stool'", which implied that Hong Kong was a party to talks on its future, alongside Beijing and London. At the preliminary stage