return of Hong Kong (to mainland China)
Refers specifically to the 1997 handover of sovereignty over Hong Kong from the United Kingdom to the People's Republic of China.
The return of Hong Kong took place in 1997.
Even after the return of Hong Kong, the 'one country, two systems' principle has been maintained.
Compound of 香港 (Honkon, 'Hong Kong') and 返還 (henkan, 'return, restoration').