Things that could of let to population growth during the industrial revolution is that many people moved to the north to work in factories . By doing this everyone would move to the cities and increase the population of the north.
While Jackson believed in a strict construction of the Constitution and in states' rights, he believed that when the Constitution had delegated power to the federal government, the federal government had to be supreme. Jackson also valued the Union and was not willing to see it compromised or to let it disintegrate.
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I would think it would be what the child looked like so if they looked more of the ethnicity then that is what they are classified.