GENERAL KNOWLEDGE

Detailed explanation-1: -Eleven million people migrated from rural to urban areas between 1870 and 1920, and a majority of the twenty-five million immigrants who came to the United States in these same years moved into the nation’s cities. By 1920, more Americans lived in cities than in rural areas for the first time in US history.

Detailed explanation-2: -The rise of mills and factories drew an influx of people to cities-and placed new demand on urban infrastructures. The rise of mills and factories drew an influx of people to cities-and placed new demand on urban infrastructures.