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Immigration from Southern Europe began to increase, with Italians and Russian Jews making up the majority.
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Eastern European Jews, Poles, Czechs, Hungarians, and others began pouring into the United States.
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The number of immigrants from Greece, Turkey and the Arab world is increasing.
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Immigrants (especially Chinese and Japanese) were affected by the Chinese Exclusion Act and the Japanese immigration Restriction Act.
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The outbreak of World War I led to an influx of immigrants from other parts of Europe, as well as an increase in emigration after the Russian Revolution.
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The passage of the Immigration Act of 1920, which provided for immigration quotas based on nationality, marked the end of this period.