Why did immigration increase from 1866 to 1915?

America’s front door was wide open, and people poured in. Between 1866 and 1915, 25 million immigrants came to the United States. Most of them came from Italy and Southeastern Europe, but they also came from Scandinavia, Russia, Poland, Germany, Ireland, England, and France. By 1910, 15 percent of the country’s

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