Question

why does cofer establish the differences between el building and eugenes home in american history?
o to reinforce that eugene and elena could never be friends because of their different backgrounds
o to help the reader better understand elenas feelings and motivations
o to show how elenas life changes after her family moves to the united states
o to criticize the class differences that existed in the 1960s

Explanation:

In "American History", the differences between El Building and Eugene's home are used to give insight into Elena's perspective. By contrasting the two environments, the reader can better understand Elena's emotions and what drives her actions. It is not mainly about showing friendship - impossibility, life - changes after moving, or criticizing class differences.

Answer:

to help the reader better understand Elena's feelings and motivations