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
British Hong Kong Empire. In 1861, Governor Sir Hercules Robinson introduced the Hong Kong Cadetship, which recruited young graduates from Britain to learn Cantonese and written Chinese for two years, before deploying them on a fast track to the Civil Service. Cadet officers gradually formed the backbone of the civil administration. After the Second World War, ethnic Chinese were allowed into the service, followed by women. Cadets were renamed Administrative Officers in the 1950s, and they remained the elite of the Civil Service during British rule. The stability, security, and predictability of British law and government enabled Hong Kong to flourish as a