The pull for the first wave of Chinese immigrants to the United States is the: "The Gold Rush in California."
- This is evident in the 1850s Chinese migration to the United States during Gold Rush.
- During this period, there was an economic downturn in China, and many Chinese seek for greener pastures.
- However, it was in the 1860s after the Gold Rush ended that the Chinese immigrants moved towards the Transcontinental railroad construction.
Hence, in this case, the correct answer is option B. The Gold Rush in California.
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