Industrialization created well-paid jobs in cities wich attracted a lot of people that were looking for a better life to an urban center. In some situations, even immigrants would come from other countries to work in factories. Therefore, the factories attract people to cities from the rural areas and from outside the country.
They started as slaves in a desert like area but soon rose up and gained their own power
<span> Geographic expansion exposed latent tensions over the morality of slavery and the balance of economic power. It was during the Era of Good Feelings that the political issues arose that would dominate American politics for the next 40 years.</span>