Answer:
Urbanization.
Step-by-step explanation:
The process of people 'migrating' to the urban areas from the rural areas is known as urbanization. In other words, it is the move from a poorer area to a richer area in the hope of a better life.
The onset of urbanization began when industries began to be built in urban areas. With the prospect of getting employment and a better future, villagers or people from the rural areas began to 'migrate' to urban areas. This movement is known as urbanization.