Why have Chinese enclaves like China Towns continued to have such a strong presence in American cities to the present day

Why have Chinese enclaves like China Towns continued to have such a strong presence in American cities to the present day

Critical Thinking Discussion Question:

Why have Chinese enclaves like China Towns continued to have such a strong presence in American cities to the present day?

What historical factors might have had an effect on the rate of Chinese-American assimilation?