Factories and their corresponding jobs were located in cities and created economic opportunities for migrants.
Industrialization leads to urbanization by generating economic growth and job opportunities that attract people to cities. In pre-industrial civilization, over 80% of people lived in agricultural areas. Rural employment was seasonal and as a result people became jobless out of season. People were poorly paid in farming jobs.
Urbanization often begins when a multiple factory was established within a region which creates the high requirement for factory labor. As migrants moved from the countryside, in search of better jobs and opportunities these small towns grown into urban centers.