What were the biggest problems in US cities in the late 1800s

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

Explanation:

the awnser is that is tru your

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answer; depression and breathing related sleep disorder(independent);