What literary device does king use to convey his point in this excerpt?

The answer would be "an allusion to the Declaration of Independence to underscore how its principles have not yet been applied to African Americans"

Explanation:

i believe it is "he will always remain extremely timid" if its wrong sorry

the answer is: round.

in literature, round characters are considerably complex and experience or are subjected to unpleasant situations. as a consequence, they go through crucial sentimental and psychological development, which can cause surprise in the readers. in this case, juan's dramatic transformation is related to the adversities he meets at school.