Answer:
Economic exploitation, social terror and political disenfranchisement were the push factors. The political push factors being Jim Crow, and in particular, disenfranchisement. Black people lost the ability to vote.
The cultural assimilation of Native Americans was an assimilation effort by the United States to transform Native American culture to European–American culture between the years of 1790 and 1920. ... It established Native American boarding schools which children were required to attend.
The answer is B: a larger urban population.
One statistic that has functioned steadily as an indicator of the level of industrialization and economic development in countries is the percentage of people living in urban areas, that is to say, people living in cities rather than on rural lands. It is a good indicator because this allows one to infer that the population of such a country is employed not in farming or fishing, but rather in industrial labor, the service industry or forms of human capital exploitation.