Ellis Island Era 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 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.
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"Roots in the Sand" is a fascinating documentary on the unique Punjabi-Mexican rural immigrant community that developed in Southern California's Imperial Valley during the late-19th century. PBS's well-designed companion website includes excerpts from the film and primary sources.
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Ellis Island was America's preeminent immigration center, processing the arrivals of more than 16 million people between 1892 and 1952. Today, Ellis Island is maintained as a museum and center for immigration history. The official Ellis Island website includes a free search tool that might let you find your own ancestors' immigration records.