Answer: The Industrial Revolution.
Step-by-step explanation:
There are many effects of the industrial revolution. One of these effects is the mass urbanization and migration of people from the countryside to the city. Cities are becoming centers of life because industrial plants are being installed in them. During the early revolution, industrial cities became places of opportunity. It is being built en masse for the needs of building capacity for new workers. Previously, villages were places where people mostly lived, given that agriculture was a major economic factor.