Answer:
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.
This also relates to your problem- How did big businesses shape the American economy in the late 1800's and early 1900's? They used railroads to transport their goods and expand their businesses across the country, which helped increase their profit, therefore making America one of the most economically powerful countries in the world.