Answer:
"ca", in this context means "circa", or "roughly". so, around the year 1200.
thus, the estimated population of London around 1200AD was 25,000
African-American leader W.E.B. DuBois noted that the first cause of migration was economic crisis. Flooding and boll weevil infestations in Alabama and Mississippi had devastated farm work there. Occurring at the same time, immigration from Europe to the United States had been curtailed. So that meant there was a strong demand for more workers to move to the industrial northern states. Thirdly, there had been outbreaks of violence against blacks in the South, notably in Georgia and South Carolina.
Moving across the country (or to a new country) is a hard decision to make. If life is bearable where people are living, they're likely to stay there and endure it. But when factors make leaving less risky or painful than staying, that's when large migrations of population will occur.
Answer:
Made African Americans citizens and gave them equal protection under the law.
Explanation:
The 14th Amendment granted citizenship to all persons born or naturalized in the United States—including former slaves—and guaranteed all citizens “equal protection of the laws.”