Answer:
The term color line was originally used as a reference to the racial segregation that existed in the United States after the abolition of slavery . An article by Frederick Douglass which was titled "The Color Line" was published in the North American Review in 1881.
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.
The US is part of the United Nations
The most difficult challenges faced by the plymouth and jamestown settlers were not starving to death, since they were unfamiliar with the territory and farming practices needed for the land, and dealing with hostile Native Americans, since many natives viewed them (correctly) as being a threat.
