The factor contributed to the population explosion in American cities is mostly due to Job opportunities
In America, the main factor that brought about growth in population size of American cities was due to high numbers of immigrants coming to the United States in search of work in American cities. Poor economic conditions on the nation's farms has lead to many americans moving to cities.
Urbanization is simply known as ann increase in the number or percentage of people living in urban centres or areas
Conclusively, the main factor that lead to the population explosion in American cities is that people were drawn to the cities because there were many jobs there.
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