The origin of Chinatown in San Francisco

/kloc-At the end of 0/9, immigrants from China were transported to California like "selling pigs" to build the Pacific Railway and the gold rush, which made great contributions to the local economic construction. But like Italian immigrants, blacks, poor whites and sailors, they were regarded as "second-class citizens" by the government at that time and were required to live in certain areas to avoid "polluting" other places. They have to live in a small area centered on Grant Street. Later, new immigrants moved here. Today, it has become a "Chinatown" and the largest Chinese community outside Asia.