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1960s–present
In the 1960s, the shifting of underutilized national immigration quotas brought in another huge wave of immigrants mostly from Hong Kong, which changed San Francisco Chinatown from predominantly Say Yip Wah(Cantonese sub-dialect of Hoisan and 3 other towns)-speaking to Sam Yip Wah(major Cantonese)-speaking. The end of the Vietnam War brought a wave of Vietnamese refugees of Chinese descent, who put their own stamp on San Francisco Chinatown. There were areas where many Chinese in Northern California living outside of San Francisco Chinatown, could maintain small communities or even individual business, but except for Oakland, they did not set up any special town with shopping and restaurants. Nonetheless, the historic rights of property owners to deed or sell their property to whom was exercised in sufficient numbers to keep the Chinese community from spreading outside of its early development. However, the Supreme Court ruled it was unconstitutional for property owners to deed their rights so that certain groups were excluded. These rulings allowed the enlargement of Chinatown and an increase of the Chinese population of the city. At the same time, the declining white population of the city as a result of White Flight combined to change the demographics of the city. Neighborhoods that were once predominately white, such as Richmond District and Sunset District and in other suburbs across the San Francisco Bay Area became centers of new Chinese immigrant communities. This included new immigrant groups such as Mandarin-speaking immigrants from Taiwan who have tended to settled in suburban Millbrae, Cupertino, Milpitas, and Mountain View – avoiding San Francisco as well as Oakland entirely. This suburbanization continues today. With these changes came a weakening of the Tongs traditional grip on Chinese life. The newer Chinese groups often came from areas outside of the Tongs' control. As a result, the influence of the Tongs and criminal groups associated with them, such as the Triads, grew weaker in Chinatown and the Chinese community in general. However, the presence of the Triads remained significant in the immigrant community, and in the summer of 1977, an ongoing rivalry between two Triads erupted in violence and bloodshed, culminating in a shooting spree at the Golden Dragon Restaurant on Washington Street (華盛頓街). Five people were killed and eleven wounded. The incident has become infamously known as the Golden Dragon massacre.^[18] The Golden Dragon closed in January 2006 because of a failed inspection of the restaurant, and is now the Imperial Palace Restaurant.^[19]

http://en.wikipedia.org/wiki/Chinatown,_San_Francisco