USA HISTORY

Detailed explanation-1: -“Cities grew because industrial factories required large workforces and workers and their families needed places to live near their jobs. Factories and cities attracted millions of immigrants looking for work and a better life in the United States.”

Detailed explanation-2: -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.

Detailed explanation-3: -There were three causes of these advances: a large supply of natural resources, an explosion of inventions, and a growing city population that wanted the new products. One of the more important natural resources was oil. In 1840 a Canadian geologist discovered that kerosene could be used to light lamps.

Detailed explanation-4: -By the mid-19th century, industrialization was well-established throughout the western part of Europe and America’s northeastern region.