Out in California, Chinese immigration hit a peak in the mid-1800s, particularly after the gold rush of 1849. Chinese laborers took on work in mines, on railroads, and along the waterfronts. They represented less than 0.2 percent of the nation’s population; yet, in response to demands for “racial purity” from white laborers and others, the 1882 Chinese Exclusion Act became the first federal law to prohibit an entire class of migrants. No Chinese person would be permitted to immigrate for ten years; and because of the Naturalization Act, no Chinese migrant living in America could be naturalized
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