Which of the following statements best describes environmental changes caused by westward railroad expansion?
a. western forests were cut down for lumber for railroad and bridge construction.
b. western factories were built in what had been wooded rural areas.
c. changes occurred only in the western plains, where animal populations decreased.
d. the railroad expansion caused no environmental changes in the west.

Question 4 of 10 2 points how were the reasons for a person's enslavement different in west african cultures than in the atlantic slave trade? o a. in west african cultures, any unmarried man could be enslaved, while in the atlantic slave trade, only prisoners of war could become slaves. o b. in west african cultures, people had to be born into slavery, while in the atlantic slave trade, people had to commit a crime to become a slave. o c. in west african cultures, people could only become slaves if they owed debts, while in the atlantic slave trade, slavery was used to punish crimes. o d. in west african cultures, people were enslaved through war or as punishment, while in the atlantic slave trade, anyone could be ſom captured and enslaved previous obi