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.
Powerpoint (presentation software)
<span>"the 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable."
They believe it is their right to expand westward!
Hope this helps! </span>
This would be called the Judicially Review