Why Did the United States Have Relatively High Fertility Rates

Why did the United States have relatively high fertility rates from 1790 through 1860?

A) The majority of the population did not use any form of birth control
B) Over one-half of the population was fecund
C) To replace all the people who died in the Revolutionary War
D) The majority of the population was semi-fecund
E) None of the above