Population growth in Mexico was very rapid until recently because of a substantial delay in

Population growth in Mexico was very rapid until recently because of a substantial delay in
 
  a. its fertility decline.
  b. its mortality decline.
  c. migration out of the country to the United States.
  d. improving agricultural productivity.

---

At about the time of the American Revolution, the United States had a birth rate that was
 
  a. very similar to the birth rate in England at the time.
  b. already lower than that of any currently developing nation.
  c. higher than birth rates even in Sub-Saharan Africa at that time.
  d. comparable to the highest national birth rates in the world today.