Early American Immigration Websites
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Harvard University's Open Collections Program is a project that allows the public to access, via the internet, thousands of resources held in the Harvard libraries. The Open Collections Program's website on Immigration to the United States is a treasure trove of primary sources on American immigration history.
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The Online Museum of the City of San Francisco contains a wealth of material dealing with the Chinese presence in California in the 19th century, and the nativist backlash against it.
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The United States Census is the best source of raw data on immigration (and many other topics in United States history). Here the Census Bureau presents a table detailing the nationality of the country's foreign-born population since 1850.