The 20th anniversary of Hong Kong's return to China was celebrated by over 10,000 Chinese-Americans in New York and San Francisco over the weekend.

Zhang Qiyue, China's consul general in New York, said at a ceremony in Foley Square next to Chinatown on Sunday that the implementation of the one country, two systems principle has been "very successful".

She spoke highly of Hong Kong's stability and economic development since China resumed sovereignty over the territory on July 1, 1997.