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 talks, the British government proposed an exchange of sovereignty for administration and the implementation of a British administration post-handover. The PRC government refused, contending that the notions of sovereignty and administration were inseparable, and although it recognised Macau as a "Chinese territory under Portuguese administration", this was only temporary. In fact, during informal exchanges between 1979 and 1981, the PRC had proposed a "Macau solution" in Hong Kong, under which it would remain under British administration at China's discretion. However, this had previously been rejected following the 1967 Leftist riots, with the then Governor, David Trench, claiming the