Answer:
The researchers believe the late 19th and early 20th century immigrants stimulated growth because they were complementary to the needs of local economies at that time. Low-skilled newcomers were supplied labor for industrialization, and higher-skilled arrivals helped spur innovations in agriculture and manufacturing. Industrial expansion and population growth radically changed the face of the nation's cities. Noise, traffic jams, slums, air pollution, and sanitation and health problems became commonplace. Mass transit, in the form of trolleys, cable cars, and subways, was built, and skyscrapers began to dominate city skylines. Urbanization in America in the late 1800s was also driven by the massive influx of unskilled immigrants who also flocked to the industrial cities to start their new life in America, the land of opportunity. Pollution and poor sanitation led to deadly epidemics in the towns and cities.
Explanation:
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