What effect did immigration have in the northeastern United States? O Hardworking immigrants created a middle class of professional workers. O Immigrants formed their own neighborhoods within American...

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Extracted text: What effect did immigration have in the northeastern United States? O Hardworking immigrants created a middle class of professional workers. O Immigrants formed their own neighborhoods within American cities. O Immigrants dominated the legislatures in those regions. O Traditional music from other nations became popular with Anglo-Americans.